Aot gen - #1965

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'
    }
}

Thanks for taking a swing at this @TimothyMakkison. This is an explicitly-incomplete draft (conflicting, ~14 months stale) and the AOT / source-gen direction is being carried forward elsewhere (see #1389), so closing to keep the PR list clean. No problem at all picking it back up — reopen or open a fresh PR against current main if you return to the AOT gen work.

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