chore: upgrade tonic and prost to 0.14

[mingley]

Summary

• Upgrade tonic to 0.14 and prost to 0.14.
• Adopt the tonic-prost runtime/codegen split and select the ring TLS backend.
• Regenerate protobuf clients and remove clones made redundant by prost 0.14 generated Copy types.

This advances the dependency alignment described in roadmap issue #506.

Testing Done

• Local code review completed
• make check
• cargo test --workspace — 116 passed, 0 failed
• cargo test --workspace --no-default-features — 116 passed, 0 failed
• make doc — passed
• PD_ADDRS=127.0.0.1:2379 MULTI_REGION=1 RUST_LOG=info NEXTEST_PROFILE=ci cargo nextest run --config-file config/nextest.toml --all --features integration-tests --test-threads 1 — 128 passed, 0 failed
• PD_ADDRS=127.0.0.1:2379 MULTI_REGION=1 RUST_LOG=info NEXTEST_PROFILE=ci cargo nextest run --config-file config/nextest.toml --test failpoint_tests --features 'integration-tests fail/failpoints' --test-threads 1 — 6 passed, 0 failed

Summary by CodeRabbit

• Improvements
  • Updated communication and protocol components for improved compatibility and maintainability.
  • Reduced unnecessary timestamp copying during transaction, lock-resolution, commit, rollback, and heartbeat operations.
  • Preserved existing transaction behavior and public APIs.

[ti-chi-bot]

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR upgrades the tonic/prost toolchain and protobuf generation, then removes unnecessary Timestamp and region-epoch cloning across lock resolution, transaction operations, heartbeats, two-phase commit, and rollback paths.

Changes

gRPC build migration and timestamp ownership

Layer / File(s)	Summary
Protobuf dependency and generation migration Cargo.toml, proto-build/Cargo.toml, proto-build/src/main.rs	The tonic/prost dependencies and TLS features are upgraded, and protobuf generation switches to tonic-prost-build with PathBuf include paths.
Lock resolution timestamp passing src/request/plan.rs, src/transaction/client.rs	Lock resolution and region-epoch handling pass stored values directly instead of cloning them.
Transaction operation timestamp passing src/transaction/transaction.rs	Read, lifecycle, heartbeat, scan, and pessimistic-lock paths remove unnecessary timestamp clones.
Committer request timestamp passing src/transaction/transaction.rs	Commit, prewrite, secondary commit, and rollback request construction passes timestamp values directly.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• tikv/client-rust#530: Both modify transaction read paths involving batch_get and scan_inner.
• tikv/client-rust#541: Both upgrade tonic/prost dependencies and TLS-related configuration.

Suggested labels: lgtm, approved, size/XL

Suggested reviewers: eduralph, pingyu, iosmanthus

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: upgrading prost and tonic to 0.14.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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