aspectran / aspectran / #4753

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feat(json): Enhance JSON parsing and serialization

This commit introduces several improvements and fixes to the JSON utility classes.

- **JsonWriter:**
    - Introduced `JsonSerializer` interface and `registerSerializer` method to support extensible custom object serialization.
    - Fixed a bug where an empty `JsonString` caused an `EOFException`; it now correctly writes `null`.
    - Corrected the custom serializer invocation logic to prevent duplicate spacing issues.
    - Refactored the internal `pendedName` variable to `pendingName` for improved clarity.

- **JsonReader:**
    - Modified `doPeek()` method to allow trailing commas in objects when lenient parsing is enabled.

- **Tests:**
    - Refactored `JsonParserTest` to include complex structure and whitespace handling tests.
    - Streamlined `JsonReaderTest` to focus solely on `JsonReader`'s core tokenizing functionality.
    - Enhanced `JsonWriterTest` with clearer method names and comprehensive tests for compact output, simple values, custom indentation, and the new serializer functionality.

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