KAFKA-14462; [14/N] Add PartitionWriter

[dajac]

This patch introduces the PartitionWriter interface in the group-coordinator module. The ReplicaManager resides in the core module and it is thus not accessible from the group-coordinator one. The PartitionWriterImpl is basically an implementation of the interface residing in core which interfaces with the ReplicaManager.

One notable difference from the usual produce path is that the PartitionWriter returns the offset following the written records. This is then used by the coordinator runtime (coming later) to track when the request associated with the write can be completed.

Committer Checklist (excluded from commit message)

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

[jolshan]

Hey David -- whenever we update appendRecords we have to modify a ton of tests that mock the method. (Basically add a ton of any(), since the mocker doesn't get default args). There are 283 failing now 😅

See here for an example of a PR that updates them: https://github.com/apache/kafka/pull/13391/files

[dajac]

Yeah, I have noticed all the failed tests. I will fix them.

[jolshan]

These connect and kraft tests are a little concerning. They seem unrelated but maybe we should file a jira.

[jeffkbkim]

LGTM!