Experimental: Replace Yajl to JSON for handling JSON stream

[Watson1978]

Which issue(s) this PR fixes:
Fixes #

What this PR does / why we need it:
An experiment to replace Yajl with JSON by leveraging ruby/json#994.

TODO

• Ensure all CI tests pass
  • Currently monitoring the edge case reported in JSON::ResumableParser raises an error unexpected end of input, expected closing " at line 1 column N ruby/json#1008
• Check for memory leaks
  • Ensure that the memory usage of JSON::ResumableParser does not grow continuously during long-running stream parsing.
• Test several edge cases for chunk boundaries
  • Chunk split in the middle of a Unicode escape sequence (e.g., \uXXXX).
  • Chunk split in the middle of primitive values (number, boolean, null):
    • e.g., {"key": tr and ue}
    • e.g., {"key": 12 and 34.56}
  • Parser recovery
    • Check whether the parser can successfully parse the next valid JSON chunk right after a JSON::ParserError is raised from a malformed chunk.

Docs Changes:

Release Note: