Feat/grpc

[markovejnovic]

No description provided.

[mesa-dot-dev]

Mesa Description

This PR introduces a new gRPC client to interact with the Mesa VCS data plane, enabling efficient, change-based file operations. It also refactors the existing REST client configuration for better consistency.

Key Changes

• gRPC Client Implementation:

  • Introduced a new ChangeClient that uses gRPC for fine-grained file manipulations (create, modify, delete, move) within a "change" context.
  • Added vcs.proto to define the gRPC services (ControlService, DataService, BlobTransferService).
  • Integrated tonic and prost dependencies for the gRPC stack and updated the build script to compile the new protobuf definitions.

• Client Configuration Refactoring:

  • Centralized configuration access in the main MesaClient.
  • Updated all existing clients (Commits, Branches, Diffs, etc.) to access configuration via self.repo.org.client.config instead of their own copies, simplifying state management.

• Updated Client Initialization:

  • Modified MesaClientBuilder to support configuring a gRPC endpoint alongside the existing REST configuration.

Testing

• Added a new suite of high-level integration tests to validate the ChangeClient functionality, covering creating changes and performing file operations.
• Updated the test harness to initialize the MesaClient with a gRPC channel for these new tests.

^{Description generated by Mesa. Update settings}

[mesa-dot-dev]

Performed full review of 0141cd1...7b17121

Analysis

1. Build script requires proto sources at compile time, but these sources are not versioned, which will break downstream builds.
2. gRPC runtime dependencies are added unconditionally without feature gates, forcing all consumers to inherit a heavy async stack before any gRPC API surface exists.
3. The PR leaves the application-layer implementation incomplete - needs either committed proto definitions with generated bindings or feature-gated build steps.
4. Current implementation will prevent the existing REST client from building until the gRPC components are fully implemented.

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