feat(sdk/js): add synchronous PoolManagerSync wrapper (Node.js)

[wangdengshan]

Summary

• Add synchronous PoolManagerSync wrapper to the JavaScript/TypeScript SDK for blocking pool management in Node.js
• Add runPoolOpSync utility using worker_threads + Atomics.wait to block the main thread while an async pool operation runs in a short-lived child worker
• Inline WORKER_SCRIPT (no separate file needed after bundling)
• Add PoolManagerSync with static create() factory, blocking CRUD methods, close(), and Symbol.dispose support (TC39 explicit resource management / using keyword)
• Export PoolManagerSync from index.ts

Testing

• Unit tests
• 50 tests across 2 test files:
  • pool.manager.sync.test.ts: API shape, payload forwarding, error propagation, post-close guard, connection config forwarding
  • pool.manager.sync.runSync.test.ts: WORKER_SCRIPT structure, WorkerResult shapes, PoolOp union, error reconstruction

Breaking Changes

• None

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[github-actions]

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Changed directories: .gitignore、sdks.

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• sdks ⬅️

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• bug - Something isn't working
• dependencies - Pull requests that update a dependency file
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💡 Tip: Use feature for new functionality or improvements, bug for fixes.

cc @wangdengshan

[wangdengshan]

Hi maintainers, could someone please add the sdks and feature labels to this PR? As an external contributor I do not have permission to add labels myself. Thanks!