This commit enhances MiniMaxChatOptions by:
- Updating `equals` and `hashCode` methods for proper object comparison.
- Updating `copy()` method, creating new instances of mutable collections (List, Set, Map, Metadata) to prevent shared state.
- Adding `MiniMaxChatOptionsTests` to verify `copy()`, builders, setters, and default values.
- Add more tests for objects not equal, defensive unmodifiable getters etc.
Signed-off-by: Alexandros Pappas <apappascs@gmail.com>
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