[ISSUE-344] Deserialize json in kafka source

[qingfei1994]

What changes were proposed in this pull request?

• new configuration for connector.format
• new JsonDeserializer extends TableDeserializer to deserialize string to row
• return JsonDeserializer according to configuration in Kafka Source

How was this PR tested?

• [x] Tests have Added for the changes
• [ ] Production environment verified

[qingfei1994]

Hi @Leomrlin could you help reivew my pr?

[Leomrlin]

qingfei1994

Hi @qingfei1994 ,

I've reviewed the PR you submitted and wanted to share a few points of feedback. I've outlined my suggestions for modification.Thank you!

[qingfei1994]

Hi @Leomrlin, I've updated my pull request as per your suggestion, could you further check?

[Leomrlin]

LGTM