Aot gen

[TimothyMakkison]

Incomplete source generated refit logic. Needless to say this PR is still in progress, I tried to throw it together.

Future Plans

• Fix the todos
• I need to do a lot of refactoring
• Check logic
• Add Query and MultiPart support
• Hopefully figure out how to reference Refittypes in the source generator without it breaking
  • This is why I had to add the Configuration types
• If my understanding of AOT is correct I can safely get the interface MethodInfo and pass it to functions.
• Support Refit should emit diagnostics for invalid interfaces #1885
• Rewrite half the tests to work with source generated logic :(

If we go ahead with this a couple of things may break.

• I don't think derived attributes will work (Is this a backwards compatibility thing)
• [Bug]: derived types erroneously add additional query parameters. #1882 will have to be fixed. Anything that does reflection on a runtime type will have to be changed (I think, I've never used AOT)

[TimothyMakkison]

Okay, after reading my notes and doing a couple of experiments:

• We might be able to support attributes inheriting from attributes, it will be very awkward and doable, although I'm not sure it would be worth it.
  • this relies on GetCustomAttributes working In aot. The generated code will be super janky
• Query parameters won't be able to support runtime serialisation. (See below)
  • It will be possible to create a compile time serializer, but it won't handle inheritance.
  • I could make this backwards compatible by:
    • Making users add an attribute somewhere to enable AotRefit. This would tell the generator to emit a compile time query serialiser.
    • Emit some code that tries to use runtime serialisation, if it fails we switch to a compile time version.
      • This would generate a load of
    • Determine if the project has PublishAot enabled (I don't know if this is possible)
      and emit compile time serialisation code

void Descend([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods)] Type t)
{
    foreach (var p in t.GetProperties())
    {
        Console.WriteLine(p.Name);
        Descend(p.PropertyType); //  't' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods'
    }
}