tarantool / go-config / 25318299422

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github

config: implement mutable configuration methods with rollback

Implement complete mutable configuration API with thread-safe operations and
validation rollback support.

- Add thread-safe read methods (Get, Lookup, Stat, Walk, Slice, Effective,
  EffectiveAll) with read-lock protection.
- Implement Set, Merge, Update, Delete methods with validation and automatic
  rollback on failure.
- Add revision increment for modified keys and mark source as "modified".
- Enhance cloneNode() to preserve Range and OrderSet properties.
- Add comprehensive test coverage for all mutable operations including
  validation failure scenarios.

All modifications now properly validate and restore previous state if
validation fails, ensuring atomicity of configuration changes.

Part of TNTP-5724

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