[raft] Add methods in replica.Replica to get IDs and range descriptor. #6520
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In replica.Replica, rename member var ShardID -> shardID and ReplicaID ->
replicaID.
In placement driver PR, I need to get access to shard id and replica id through interface
functions; and golang doesn't allow me to create ShardID() when there is
a ShardID member variable.
Also, changing it to private variables make it impossible for other
classes to accidentally change shard id and replica id.
Related issues: N/A