Refactor snapshot #2661

Job	Run time
lint	11m 11s
external-stores (stores/rocksstore-v2)	13m 29s
cluster-benchmark (cluster_benchmark)	1m 15s
openraft-feature-test (nightly)	1m 34s
openraft-test-bench (nightly)	1m 52s
openraft-feature-test (nightly, serde)	1m 32s
examples (stable, raft-kv-memstore)	2m 59s
openraft-test (stable, 0)	5m 42s
openraft-feature-test (nightly, single-term-leader)	1m 23s
examples (stable, raft-kv-rocksdb)	13m 14s
openraft-test (nightly, 30)	4m 23s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	1m 20s
stores (memstore)	1m 3s
examples (nightly, raft-kv-memstore)	4m 12s
openraft-test (nightly, 0, single-term-leader)	4m 20s
examples (nightly, raft-kv-rocksdb)	25m 10s
stores (rocksstore)	10m 5s
stores (rocksstore-compat07)	10m 35s
Build (nightly, bench,serde,bt,singlethreaded)	1m 26s
tests-feature-test (nightly)	3m 55s
tests-feature-test (nightly, single-term-leader)	4m 22s
stores (sledstore)	1m 42s
tests-feature-test (nightly, loosen-follower-log-revert)	4m 31s
	2h 11m 15s

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