DEBUG logs of grpc requests as JSON objects

[shsms]

What's needed?

When debug logging is enabled, all requests to the GRPC servers should be serialised as JSON and logged.

Headers should not be included.

Proposed solution

This would need some research and design changes, because the current implementation does not allow the base client access to the arguments passed to stub methods.

Use cases

This provides a quick way to generate reproducible examples for requests when needed.

[llucax]

Maybe we want a VCR for gRPC? 😱