wuwen5 / hessian

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Add Hessian serialization support for Java Time API types (#68)

* Initial plan

* Add Hessian serialization support for Java Time API types

- Implemented serializers for LocalDateTime, MonthDay, ZoneOffset, OffsetTime, OffsetDateTime, ZonedDateTime, YearMonth, Year, Period, and ZoneId
- Implemented corresponding deserializers for all new types
- Registered all serializers/deserializers in META-INF files
- Added comprehensive tests for all new types in JavaTimeTest
- Created manual validation test to verify serialization correctness
- All types use compact binary encoding without introducing replacement types
- Existing types (Duration, Instant, LocalTime, LocalDate) remain unchanged

Co-authored-by: wuwen5 <5037807+wuwen5@users.noreply.github.com>

* Refactor OffsetDateTime and ZonedDateTime serialization to use nested objects

- Changed OffsetDateTime serialization to use LocalDateTime + ZoneOffset objects instead of primitives
- Changed ZonedDateTime serialization to use LocalDateTime + ZoneId objects instead of primitives
- Updated deserializers to properly handle reference tracking with setRef for immutable objects
- All tests pass, serialization/deserialization works correctly
- Trade-off: Slightly larger serialized size but better code reuse and maintainability

Co-authored-by: wuwen5 <5037807+wuwen5@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wuwen5 <5037807+wuwen5@users.noreply.github.com>

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