Fix: timezone-related test failures in JsonNormalizerTest (#83)

[nileader]

The JsonNormalizerTest in the JToon project contains 4 test cases related to time types that fail in my UTC+8 timezones because they use hardcoded expected values, while JsonNormalizer uses the system default timezone when processing SQL time types.

Linked Issue

Closes #83

Description

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test coverage improvement

Changes Made

For dev.toonformat.jtoon.normalizer.JsonNormalizerTest

• Replace hardcoded timezone values with dynamic computation based on system timezone
• Update testSQLTime to use time.toLocalTime().format(DateTimeFormatter.ISO_LOCAL_TIME)
• Update testSQLTimeStamp to use dateTime.toLocalDateTime().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
• Update Calendar and GregorianCalendar tests to use input.toInstant().toString()
• Add missing DateTimeFormatter import for time formatting

Testing

• All existing tests pass
• Added new tests for changes
• Tests cover edge cases and spec compliance

Pre-submission Checklist

• My code follows the project's coding standards
• I have run code formatting/linting tools
• I have added tests that prove my fix/feature works
• New and existing tests pass locally
• I have updated documentation if needed
• I have reviewed the TOON specification for relevant sections

Breaking Changes

• No breaking changes
• Breaking changes (describe migration path below)

[github-actions]

Code Coverage

Overall Project	98.22%	🍏

There is no coverage information present for the Files changed