Add logging via the ILogger interface

[lorenzo93]

Hi,

.NET has this beautiful interface called ILogger from the Microsoft.Extensions.Logging package. It is an interface which is implemented by all the most famous loggers in C#. Moreover, it is natively supported by the Dependency Injection framework internal to .NET.
This way, each programmer has the ability to use your bot connecting his preferred logger and having your internal messages logged.

I think it would be a great improvement :)

[tuscen]

If you need to log client requests you can do it yourself using OnMakingApiRequest and OnApiResponseReceived events. They are async and have access to underlying HttpRequestMessage and HttpResponseMessage.