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This change adds resource handle type `__hlsl_resource_t` to the list of types recognized in the Clang's built-in functions prototype string. HLSL has built-in resource classes and some of them have many methods, such as [Texture2D](https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/sm5-object-texture2d). Most of these methods will be implemented by built-in functions that will take resource handle as an argument. This change enables us to move from generic `void(...)` prototype string for these methods and explicit argument checking in `SemaHLSL.cpp` to a prototype string with explicit argument types. Argument checking in `SemaHLSL.cpp` can be reduced to handle just the rules that cannot be expressed in the prototype string (for example verifying that the offset value in `__builtin_hlsl_buffer_update_counter` is `1` or `-1`). In order to make this work, we now allow conversions from attributed resource handle type such as `__hlsl_resource_t [[hlsl::resource_class(UAV)]] [[hlsl::contained_type(float)]]` to a plain non-attributed `__hlsl_resource_t` type.