Fix TypeError in debug logging when data contains sets

[takechanman1228]

This PR fixes a bug where TinyPersonFactory crashes with a TypeError when logging level is set to INFO or DEBUG in config.ini. ( Issue: #140 )

Error message:

TypeError: Object of type set is not JSON serializable

Root Cause

The issue occurs in 4 locations in tiny_person_factory.py where json.dumps() is used for debug logging:

1. Line 300 - generate_person(): Generated person parameters
2. Line 532 - _initialize_sampling_plan_transaction(): Sampling dimensions
3. Line 548 - _initialize_sampling_plan_transaction(): Sampling plan
4. Line 562 - _initialize_sampling_plan_transaction(): Remaining characteristics sample

All of these data structures may contain Python set objects (likely used for deduplication/uniqueness), which are not JSON serializable by default.

Changes

Added:

• _safe_json_dumps() helper function (after line 21). This function converts set objects to list before serialization, preserving the debug output while avoiding the crash.

Modified (4 locations):

• Line 300: generate_person() - Use _safe_json_dumps() for person parameters
• Line 532: _initialize_sampling_plan_transaction() - Use _safe_json_dumps() for sampling dimensions
• Line 548: _initialize_sampling_plan_transaction() - Use _safe_json_dumps() for sampling plan
• Line 562: _initialize_sampling_plan_transaction() - Use _safe_json_dumps() for remaining characteristics

[takechanman1228]

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