does wiremock.net fully support grpc mocking for .net development?

WireMock.Net is actually a port of WireMock, maintained by a different open source team. We host a channel for them here at #C059E0MBM29, that's probably your best bet on this slack. They have a gitter at https://gitter.im/wiremock_dotnet/Lobby and GitHub discussions at https://github.com/orgs/WireMock-Net/discussions.