[Tracking issue] Add more JSON UDFs

[WenyXu]

What problem does the new feature solve?

The previous tracking issue #4230 introduced some basic JSON UDFs. This tracking issue aims to expand on that by adding more advanced UDFs, enabling more powerful querying capabilities.

What does the feature do?

• JSON_OBJECT_KEYS Returns an Array containing the list of keys in the input JSON Object.
• JSON_PATH_EXISTS Checks whether a specified path exists in JSON data.
• JSON_PATH_MATCH Checks whether a specified JSON path expression matches certain conditions within a JSON data.
  ...

Implementation challenges

No response

[sunng87]

reference https://www.depesz.com/2024/10/11/sql-json-is-here-kinda-waiting-for-pg-17/