Implemented gRPC client and server for snapshot management, enabling remote operations like listing, fetching, and downloading snapshots. Updated interfaces to support the new gRPC implementation and integrated server start functionality into the API.
Introduces core functionality for the Agate library, including snapshot creation, restoration, listing, and deletion. Adds examples for basic usage, gRPC proto definitions, and build/configuration files such as `go.mod` and `Makefile`. The implementation establishes the framework for store integration and placeholder server functionality.
