draft: feat: enable F# LSP for *.fsx files on any folder

[adelarsq]

I have used this config for some time. I think that can be added to the default configs, since I didn't notice drawbacks:

local util = require 'lspconfig.util'
lspconfig.fsautocomplete.setup({
    on_attach = my_on_attach,
    root_dir = util.root_pattern('*.sln', '*.fsproj', '.git', '*.fsx'),
    capabilities = my_capabilities,
    filetypes = { 'fsharp' }
})

Note: I have closed the previous PR to satisfy the lint.

[glepnir]

.fsx is fsharp script file right ? I don't think pass it as root dir pattern is correct.

[adelarsq]

@glepnir Yes. Is there any other way to provide the root dir for the LSP on this case? The only way that has worked so far was like that.

[glepnir]

does this script file can be outside fsharp project?

[adelarsq]

@glepnir Yes. *.fsx files can be used that same way that *.sh are used.

With .NET installed you can use something like dotnet fsi somefile.fsx.

[glepnir]

okay. can you try set it into filetype and config dotnet support single file mode ?

[adelarsq]

@glepnir Cool idea! I will try to make it to work. For now I will keep this PR as draft