feat(object：：): implement multi-tier adaptive optimization for Object::get

[dongowu]

• Add size-based adaptive search strategies

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• [ ] This PR title match the format: <refactor>(optional scope): <description>
• [ ] The description of this PR title is user-oriented and clear enough for others to understand.
• [ ] Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo

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Object::get方法引入了基于对象大小的智能优化策略

1. ​​动态策略切换​​：根据对象规模自动选择linear、SIMD 、hash或cache
2. 兼容性​​：完全向后兼容，无 API 变更
3. ​​关键优化​​：
   • 中对象采用 SIMD 加速字符串比对
   • 大对象启用全局缓存哈希表

(Optional) Which issue(s) this PR fixes:

Fixes #168

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[PureWhiteWu]

@cursor review

[liuq19]

cloud you give more benchmarks to show the optimization

[liuq19]

thanks, cloud you provide the benchmark results