KAFKA-16505: Add source raw bytes in processorContex

[Dabz]

Pull request to implement KIP-1034, it adds the records source byte in the processor context

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[loicgreffier]

@cadonna @Dabz Just linking the following PR #16684 that has been reverted.

We faced some issues with store caches. I suppose these issues are still relevant in this PR. Going to check and keep this feed updated.

[loicgreffier]

From my tests, the following topology:

builder
  .stream()
  .groupByKey()
  .windowedBy(...) // Does not really matter. NPE thrown windowing or not
  .aggregate(...)
  .mapValues(value -> throw new RuntimeException(...))

Is not throwing a NPE anymore (compared to the previous PR #16684), since we're using sourceRawKey and sourceRawValue in ProcessorNode instead of rawRecord().key and rawRecord().value.

However, sourceRawKey and sourceRawValue are lost and not forwarded to the ProcessingExceptionHandler. Opening a new PR to address this case: #18739.

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[cadonna]

Superseded by #18739