[controller] Client side foundations and refactor to support gRPC transport for controller APIs

[mynameborat]

Summary, imperative, start upper case, don't end with a period

• Introduces new controller transport client for gRPC
• Introduce interfaces and models for writing new controller APIs / migrating existing ones to use gRPC transport
• Demonstrate the foundations and patterns with createStore API

How was this PR tested?

Unit tested

Does this PR introduce any user-facing changes?

• No. You can skip the rest of this section.
• Yes. Make sure to explain your proposed changes and call out the behavior change.