[FEATURE REQ] Resolve Native AOT Warnings in Microsoft.Azure.Cosmos

[eerhardt]

Is your feature request related to a problem? Please describe.
I would like to use Microsoft.Azure.Cosmos in a native AOT'd application. However, it is not currently possible.

Describe the solution you'd like
Make Microsoft.Azure.Cosmos compatible with native AOT. See https://devblogs.microsoft.com/dotnet/creating-aot-compatible-libraries/ for instructions/tips for how to do this. We should drive the warnings to 0.

Describe alternatives you've considered
N/A

Additional context
When I publish an app that has the following code:

            var cosmosClient = _serviceProvider.GetRequiredService<CosmosClient>();

            var db = (await cosmosClient.CreateDatabaseIfNotExistsAsync("db")).Database;
            var container = (await db.CreateContainerIfNotExistsAsync("entries", "/Id")).Container;

            var newEntry = new ToDoActivity() { id = Guid.NewGuid().ToString(), status = message };
            await container.CreateItemAsync(newEntry);

I get the following warnings:

C:\Users\eerhardt\.nuget\packages\microsoft.azure.cosmos\3.38.1\lib\netstandard2.0\Microsoft.Azure.Cosmos.Client.dll : warning IL2104: Assembly 'Microsoft.Azure.Cosmos.Client' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
ILC : warning IL3000: Microsoft.Azure.Documents.ServiceInteropWrapper.CheckIfAssembliesExist(String&): 'System.Reflection.Assembly.Location.get' always returns an empty string for assemblies embedded in a single-file app. If the path to the app directory is needed, consider calling 'System.AppContext.BaseDirectory'. [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
ILC : warning IL3000: Microsoft.Azure.Documents.ServiceInteropWrapper.CheckIfAssembliesExist(String&): 'System.Reflection.Assembly.Location.get' always returns an empty string for assemblies embedded in a single-file app. If the path to the app directory is needed, consider calling 'System.AppContext.BaseDirectory'. [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
C:\Users\eerhardt\.nuget\packages\system.configuration.configurationmanager\6.0.0\lib\net6.0\System.Configuration.ConfigurationManager.dll : warningIL2104: Assembly 'System.Configuration.ConfigurationManager' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries[C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
C:\Users\eerhardt\.nuget\packages\newtonsoft.json\10.0.2\lib\netstandard1.3\Newtonsoft.Json.dll : warning IL2104: Assembly 'Newtonsoft.Json' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
C:\Users\eerhardt\.nuget\packages\newtonsoft.json\10.0.2\lib\netstandard1.3\Newtonsoft.Json.dll : warning IL3053: Assembly 'Newtonsoft.Json' produced AOT analysis warnings. [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
C:\Users\eerhardt\.nuget\packages\runtime.win-x64.microsoft.dotnet.ilcompiler\8.0.2\framework\System.Linq.Expressions.dll : warning IL3053: Assembly'System.Linq.Expressions' produced AOT analysis warnings. [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
C:\Users\eerhardt\.nuget\packages\runtime.win-x64.microsoft.dotnet.ilcompiler\8.0.2\framework\Microsoft.CSharp.dll : warning IL3053: Assembly 'Microsoft.CSharp' produced AOT analysis warnings. [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
C:\Users\eerhardt\.nuget\packages\microsoft.azure.cosmos\3.38.1\lib\netstandard2.0\Microsoft.Azure.Cosmos.Direct.dll : warning IL2104: Assembly 'Microsoft.Azure.Cosmos.Direct' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]
C:\Users\eerhardt\.nuget\packages\microsoft.azure.cosmos\3.38.1\lib\netstandard2.0\Microsoft.Azure.Cosmos.Direct.dll : warning IL3053: Assembly 'Microsoft.Azure.Cosmos.Direct' produced AOT analysis warnings. [C:\Users\eerhardt\source\repos\AspireApp15\AspireApp15.ApiService\AspireApp15.ApiService.csproj]

When I try to run the produced executable the first error I hit is:

Unhandled Exception: System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize
 ---> System.MissingMethodException: No parameterless constructor defined for type 'System.Configuration.ClientConfigurationHost'.
   at System.ActivatorImplementation.CreateInstance(Type, Boolean) + 0x119
   at System.Configuration.Internal.ConfigSystem.System.Configuration.Internal.IConfigSystem.Init(Type, Object[]) + 0x43
   at System.Configuration.ClientConfigurationSystem..ctor() + 0x47
   at System.Configuration.ConfigurationManager.EnsureConfigurationSystem() + 0x56
   --- End of inner exception stack trace ---
   at System.Configuration.ConfigurationManager.EnsureConfigurationSystem() + 0xea
   at System.Configuration.ConfigurationManager.PrepareConfigSystem() + 0x12
   at System.Configuration.ConfigurationManager.GetSection(String) + 0x18
   at System.Configuration.ConfigurationManager.get_AppSettings() + 0x11
   at Microsoft.Azure.Cosmos.DocumentClient.Initialize(Uri, ConnectionPolicy, Nullable`1, HttpMessageHandler, ISessionContainer, Nullable`1, IStoreClientFactory, TokenCredential, String, RemoteCertificateValidationCallback, CosmosClientTelemetryOptions) + 0x1bd
   at Microsoft.Azure.Cosmos.DocumentClient..ctor(Uri, AuthorizationTokenProvider, EventHandler`1, ConnectionPolicy, Nullable`1, JsonSerializerSettings, ApiType, EventHandler`1, HttpMessageHandler, ISessionContainer, Nullable`1, Func`2, IStoreClientFactory, Boolean, String, RemoteCertificateValidationCallback, CosmosClientTelemetryOptions, IChaosInterceptorFactory) + 0x1fd
   at Microsoft.Azure.Cosmos.ClientContextCore.Create(CosmosClient, CosmosClientOptions) + 0x1bd
   at Microsoft.Azure.Cosmos.CosmosClient..ctor(String, AuthorizationTokenProvider, CosmosClientOptions) + 0x10e
   at Microsoft.Extensions.Hosting.AspireMicrosoftAzureCosmosDBExtensions.<>c__DisplayClass3_0.<AddAzureCosmosDB>g__ConfigureDb|3() + 0xc3

Note that Newtonsoft.Json is not currently AOT compatible (and looks likely it will never be). See JamesNK/Newtonsoft.Json#2732. The only JSON object serialization and deserialization that works with native AOT is the System.Text.Json source generator. Or else you need to use the reader/writer APIs or JsonDocument/JsonNode APIs.