Refactor: `ReplicationCore` get a snapshot directly from state machin… #3378

Job	Run time
openraft-test-bench (nightly)	57s
openraft-test (stable, 0)	3m 16s
openraft-test (nightly, 30)	3m 44s
Build (nightly, bench,serde,bt,singlethreaded)	51s
openraft-test (nightly, 0, single-term-leader)	3m 31s
cluster-benchmark (cluster_benchmark)	47s
stores (stores/memstore)	55s
stores (stores/rocksstore)	6m 18s
stores (stores/sledstore)	1m 1s
openraft-feature-test (nightly)	53s
openraft-feature-test (nightly, serde)	54s
examples (stable, memstore)	42s
openraft-feature-test (nightly, single-term-leader)	51s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	52s
examples (stable, raft-kv-memstore)	2m 17s
examples (stable, raft-kv-memstore-generic-snapshot-data)	1m 0s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 33s
lint	6m 49s
examples (stable, raft-kv-memstore-singlethreaded)	1m 5s
tests-feature-test (nightly)	3m 8s
examples (stable, raft-kv-rocksdb)	9m 7s
examples (nightly, memstore)	54s
tests-feature-test (nightly, single-term-leader)	3m 9s
examples (nightly, raft-kv-memstore)	2m 15s
examples (nightly, raft-kv-memstore-generic-snapshot-data)	1m 20s
tests-feature-test (nightly, loosen-follower-log-revert)	3m 12s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 57s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 24s
examples (nightly, raft-kv-rocksdb)	12m 44s
	1h 17m 26s

Provide feedback