[FEAT]: Replace Rust specific protocol definitions with protobufs

[SeedyROM]

• Remove protocol.rs
• Setup prost and protobuf codegen
• Update server.rs to use the protobufs
• Create methods to convert between the protobuf Value enum and the KV's Value enum.
• Fix tests and benchmarks

[Copilot]

Pull Request Overview

This PR replaces the custom Rust-specific protocol definitions with protobuf definitions across the codebase, updating serialization/deserialization and relevant dependencies accordingly. Key changes include:

• Removal of the custom protocol module (protocol.rs) and addition of the protobuf definitions (protocol/bonka.proto).
• Introduction of a new proto module (proto.rs) and updating conversions in the key-value store (kv.rs) to work with the new protobufs.
• Adjustments in the benchmarking and build configuration files to support protobuf code generation and usage.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/protocol.rs	Removed obsolete protocol definitions.
src/proto.rs	Added module to include generated protobuf definitions.
src/lib.rs	Updated module import from protocol to proto.
src/kv.rs	Added conversions between KV Value enum and protobuf Value.
protocol/bonka.proto	Added protobuf definitions for Value, Command, Request, Response.
build.rs	Updated to compile the protobuf definitions via prost_build.
benches/bonka_benchmark.rs	Revised to use protobuf serialization and deserialization.
Cargo.toml	Added dependencies for prost, prost-types, and prost-build.

[codecov]

Codecov Report

Attention: Patch coverage is 95.98765% with 13 lines in your changes missing coverage. Please review.

Project coverage is 91.61%. Comparing base (cfe5e66) to head (f01220f).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/kv.rs	75.00%	8 Missing ⚠️
src/server.rs	98.28%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   90.31%   91.61%   +1.29%     
==========================================
  Files           8        7       -1     
  Lines        1064     1204     +140     
==========================================
+ Hits          961     1103     +142     
+ Misses        103      101       -2     

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