Feature Request: google.protobuf.FieldMask support

[levtul]

Despite the fact that many well-known types are already being supported, google.protobuf.FieldMask still gets a syntax error when you try to use it in request.

Previously mentioned by @oheyzhiwei in #13 (comment)_

[rarguelloF]

Having same issue 😢 Is there any workaround?

[levtul]

To send FieldMask in messages I use Evans or BloomRPC, but they have their own limitations in other features :(