Use separate channel to receive replication events

[drmingdrmer]

Currently, replication events, such as updating replication progress, are
transmitted via the notify channel. Since multiple leaders(with distinct votes)
share this channel on a single node, a new leader might receive a progress event
intended for a previous leader.

This issue is resolved by comparing the vote of the leader with the progress
event. If the event's vote differs from the current leader's vote, the event
is disregarded.

To simplify this process, a separate channel can be created for each leader, and
the channel can be abandoned when a leader steps down, such as when a higher
vote is observed. This approach eliminates the need for further vote
comparisons.

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