Inject kafka metadata fields

[hudi-bot]

There is a need to add a kafka metadata into incoming data coming from Kafka stream. It is super useful for tracing purposes.

JIRA info

• Link: https://issues.apache.org/jira/browse/HUDI-1648
• Type: Improvement

[hudi-bot]

Linked PR(s)

• [HUDI-1648] Added custom kafka meta fields and custom kafka avro decoder. #2598