#9687 fix: Serialize nested date-time values in plugin configuration Pull request opened by edgarrmondragon ## Description ## Related Issues • Closes #XXXX ## Summary by Sourcery Ensure plugin configurations and related JSON outputs correctly serialize date and datetime values while improving error handling for catalog rule application. Bug Fixes: • Fix JSON serialization of date and datetime values in singer tap configuration files, including nested structures and lists. • Fix JSON serialization of complex configuration payloads and CLI config output that may contain date-like values. Enhancements: • Improve PluginExecutionError construction in catalog rule application by simplifying error message handling. Tests: • Add regression test verifying that singer tap before_configure properly serializes date and datetime objects, including nested and list values, to ISO-formatted JSON. ## Summary by Sourcery Ensure singer plugin configuration and related JSON outputs correctly serialize date and datetime values while improving catalog rule error handling. Bug Fixes: • Serialize date and datetime values in singer tap configuration files, including nested objects and lists, using a custom JSON encoder. • Use the same custom JSON encoder when generating catalog cache keys and CLI JSON config output to avoid serialization errors for date-like values. Enhancements: • Simplify PluginExecutionError construction and messaging when catalog files are missing or invalid. Tests: • Add an async regression test validating that singer tap before_configure writes ISO-formatted date and datetime values, including nested and list entries, to its JSON config file. meltano/meltano