[Bug]: Implement ReadIndex

[bsbds]

Description about the bug

When a network partition occurs, the leader in the smaller partition may not be aware that a new leader has already been elected in the cluster. If the original leader continues to serve read-only requests to clients during this time, it could result in stale reads. We should implement ReadIndex to enable read-only request on the leader.

Version

0.1.0

Relevant log output

No response

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