implement get_json_object

[zhouyuan]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
implement get_json_object https://spark.apache.org/docs/latest/api/sql/index.html#get_json_object

Describe the solution you'd like
implement Spark built-in function get_json_ojbect

Describe alternatives you've considered
N/A

Additional context
N/A