[Enhancement] Support to read json column

[banmoy]

What type of PR is this：

• [ ] BugFix
• [ ] Feature
• [X] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

Which issues of this PR fixes ：

StarRocks supports conversion from JSON type to Arrow String type in https://github.com/StarRocks/starrocks/pull/25044 , so connector can support read StarRocks json column to Flink string now

Problem Summary(Required) ：

Checklist:

• [x] I have added test cases for my bug fix or my new feature
• [ ] This pr will affect users' behaviors
• [ ] This pr needs user documentation (for new or modified features or behaviors)
• [ ] I have added documentation for my new feature or new function

[wmtbnbo]

What type of PR is this：

• [ ] BugFix
• [ ] Feature
• [x] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

Which issues of this PR fixes ：

StarRocks supports conversion from JSON type to Arrow String type in StarRocks/starrocks#25044 , so connector can support read StarRocks json column to Spark string now

Problem Summary(Required) ：

Checklist:

• [x] I have added test cases for my bug fix or my new feature
• [ ] This pr will affect users' behaviors
• [ ] This pr needs user documentation (for new or modified features or behaviors)
• [ ] I have added documentation for my new feature or new function

Hello, I have followed the PR you submitted and read the JSON data as follows. However, I still cannot read JSON. Can you give me some advice? Thank you.