Refactor snapshot #2664

Job	Run time
external-stores (stores/rocksstore-v2)	9m 51s
openraft-test-bench (nightly)	1m 26s
stores (memstore)	1m 5s
stores (rocksstore)	13m 29s
stores (rocksstore-compat07)	12m 53s
lint	10m 35s
examples (stable, raft-kv-memstore)	3m 13s
stores (sledstore)	1m 17s
examples (stable, raft-kv-rocksdb)	13m 15s
cluster-benchmark (cluster_benchmark)	1m 21s
examples (nightly, raft-kv-memstore)	5m 4s
openraft-feature-test (nightly)	1m 9s
openraft-test (stable, 0)	4m 21s
examples (nightly, raft-kv-rocksdb)	24m 44s
openraft-feature-test (nightly, serde)	1m 32s
openraft-test (nightly, 30)	5m 0s
openraft-feature-test (nightly, single-term-leader)	1m 29s
Build (nightly, bench,serde,bt,singlethreaded)	1m 12s
openraft-test (nightly, 0, single-term-leader)	4m 10s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	1m 13s
tests-feature-test (nightly)	3m 57s
tests-feature-test (nightly, single-term-leader)	4m 20s
tests-feature-test (nightly, loosen-follower-log-revert)	4m 42s
	2h 11m 18s

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