Refactor snapshot #2657

Job	Run time
Build (nightly, bench,serde,bt,singlethreaded)	1m 15s
external-stores (stores/rocksstore-v2)	9m 26s
cluster-benchmark (cluster_benchmark)	1m 6s
openraft-feature-test (nightly)	1m 23s
openraft-feature-test (nightly, serde)	1m 10s
openraft-test (stable, 0)	5m 38s
openraft-feature-test (nightly, single-term-leader)	1m 24s
openraft-test-bench (nightly)	1m 56s
openraft-test (nightly, 30)	5m 22s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	1m 42s
openraft-test (nightly, 0, single-term-leader)	4m 9s
stores (memstore)	1m 28s
tests-feature-test (nightly)	4m 45s
stores (rocksstore)	13m 20s
examples (stable, raft-kv-memstore)	2m 22s
tests-feature-test (nightly, single-term-leader)	5m 4s
stores (rocksstore-compat07)	14m 3s
examples (stable, raft-kv-rocksdb)	10m 48s
tests-feature-test (nightly, loosen-follower-log-revert)	4m 0s
stores (sledstore)	1m 21s
examples (nightly, raft-kv-memstore)	2m 0s
examples (nightly, raft-kv-rocksdb)	10m 12s
lint	16s
	1h 44m 10s

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