#9621 fix: Handle stringification of nested date values in plugin configuration Pull request opened by edgarrmondragon ## Description ## Related Issues • Closes #XXXX ## Summary by Sourcery Use a custom JSON encoder to serialize date and datetime values as ISO strings when stringifying settings, update the stringify processor to leverage it, and add tests for nested complex objects. Bug Fixes: • Ensure nested date and datetime values in object settings are serialized to ISO strings instead of raw datetime objects Enhancements: • Introduce SettingValueJSONEncoder and json_dumps wrapper to handle date/datetime encoding in setting definitions • Update VALUE_PROCESSORS and stringify_value to use json_dumps for consistent serialization Tests: • Add test_stringify_complex_object to verify JSON output for settings containing nested dates, datetimes, lists, and dicts meltano/meltano