[mono] Make some icalls pass/return object references using ObjectHandleOnStack/QCall...

[mono] Make some icalls pass/return object references using ObjectHandleOnStack/QCallTypeHandle (#62141)

* [mono] Make some icalls return objects using an extra ObjectHandleOnStack argument.

* Fix the passing of scalar vtypes on wasm.

* Convert RuntimeTypeHandle icalls to receive a QCallTypeHandle.

Also do some other cleanups:
* Convert some icalls which don't receive/return objects any more and don't
  return an error to NOHANDLES.
* Implement IsGenericVariable in managed code.
* Add a separate GetMetadataToken icall to avoid the REUSE_WRAPPER stuff.
* Sync the implementation of IsTypeDefinition with coreclr.

* Convert some RuntimeType icalls to use QCallTypeHandles/ObjectHandleOnStack.

* Fix RuntimeType.GetPacking () to work with dynamic types.

* Convert internal_from_name to use QCallTypeHandles/ObjectHandleOnStack.

* Convert more icalls.

* Update src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/QCallHandles.cs

Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>
* Remove unused argument from RuntimeTypeHandle:internal_from_name ().

* Add support for FRAME_TYPE_IL_STATE to the metadata stack walker code.

* Update coding style in QCallTypeHandle:.ctor ().

* Revert "Convert more icalls."

* Convert some Delegate icalls.

* Convert some Enum icalls.

* Convert some Marshal icalls.

* Avoid creating RuntimeType objects while AOTing.

* Convert some RuntimeType icalls.

Co-authored-by: Aleksey Kliger (λgeek) <akliger@gmail.com>