raft: replicate commands on state machine

[Abby3017]

Create a function that will run commands sent by leader on all follower nodes after they get committed msg from the leader.

If the leader commitIndex is greater than Node commitIndex run all the logs on the follower state machine and update node lastApplied

Additional context
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To read more about functionality and logic according to raft , go through design doc in this project.

[tpdenk]

@SUMUKHA-PK the hook is there in the server, @Abby3017 please figure out (with @SUMUKHA-PK 's help) how to refactor this to use the hook.