feat(raft): add versioned proto definitions (kiwi.raft.v1)

[guozhihao-224]

Summary

• Add proto3 definitions with versioned package kiwi.raft.v1 for RaftCoreService, RaftAdminService, RaftClientService, RaftMetricsService
• Add build.rs with tonic-build configuration using versioned descriptor filename (kiwi.raft.v1_descriptor.bin)
• Update lib.rs to include raft_proto module with versioned proto package

This is PR 1/5 in a series to migrate the gRPC Raft Network implementation from feat/raft:

1. Proto definitions + build config (this PR)
2. gRPC error types → base: this branch
3. gRPC network layer with retry → base: PR ci: check code and pr title, pr labels #2
4. Type conversion + log_id tracking → base: PR Optimize: 降低lru_cache中trim的时间复杂度 #3
5. Cluster management scripts → base: PR kiwi-rs 第一阶段任务 #4

Test plan

• Verify proto files define correct services and messages
• Verify build.rs compiles proto with kiwi.raft.v1 package
• Verify lib.rs correctly includes the versioned proto module

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 85728e9b-a044-430e-805f-bcd750c3fbfe

📥 Commits

Reviewing files that changed from the base of the PR and between 5e51942 and ebf95f9.

📒 Files selected for processing (6)

• src/raft/build.rs
• src/raft/proto/admin.proto
• src/raft/proto/client.proto
• src/raft/proto/raft.proto
• src/raft/proto/types.proto
• src/raft/src/lib.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/raft-proto-versioning

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