Should GrpcChannel provide ChannelBase.ShutdownAsync() functionality?

Currently there's a discrepancy in GrpcChannel (grpc-dotnet) and Channel (Grpc.Core) behavior when it comes to shutdown.

- Both classes inherit from ChannelBase, but only Channel provides a meaningful implementation of channel.ShutdownAsync() (through overriding ChannelBase.ShutdownAsyncCore() method). For GrpcChannel, invoking ShutdownAsync() is a no-op.
- on the other hand GrpcChannel provides a Dispose() method (not provided by Channel).

https://github.com/grpc/grpc/blob/1cd6e69347cbf62a012477fe184ee6fa8f25d32c/src/csharp/Grpc.Core.Api/ChannelBase.cs#L72

https://github.com/grpc/grpc/blob/1cd6e69347cbf62a012477fe184ee6fa8f25d32c/src/csharp/Grpc.Core/Channel.cs#L214

The issue is that when using channels gRPC in .NET, one must specialize the channel shutdown based on knowing the concrete implementation of a given channel (and use Channel.ShutdownAsync() or GrpcChannel.Dispose() based on that).

Could this be solved by e.g. making GrpcChannel.ShutdownAsync() basically behave the same way as Dispose()?