raftstore-v2: store heartbeat supports write keys and bytes.

[bufferflies]

What is changed and how it works?

Issue Number: Ref #12842

What's Changed:

1. store heartbeat supports write keys and bytes.

Related changes

Check List

Tests

• Integration test
• Manual test (add detailed scripts or steps below)

Side effects

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• BusyJay
• tonyxuqqi

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[bufferflies]

/cc @tonyxuqqi @tabokie @BusyJay

[bufferflies]

/ping @BusyJay @tabokie

[BusyJay]

/merge

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: b501db1