(draft) feat: added historical plans w.r.t. new processor apis

[hrishabhg]

Note: Will hold until migration of flatTransformValues

Description

• Generated plans with processor APIs
• Fixed Json Serialization for TestHeader

Testing done

• No changes in plan. However, a timeStampColumn is visible in new plans.
• Changes are there in topology from node naming perspective and new nodes are also appended but state store names remained same.
  state-stores.diff.txt

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")
• Do these changes have compatibility implications for rollback? If so, ensure that the ksql command version is bumped.

[confluent-cla-assistant]

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