Refactor: Improve log entry processing on startup #4055

Job	Run time
cluster-benchmark (cluster_benchmark)	53s
lint	11m 55s
examples (stable, memstore)	37s
examples (stable, raft-kv-memstore)	2m 31s
openraft-feature-test (nightly)	54s
openraft-test (stable, 0)	3m 34s
examples (stable, raft-kv-memstore-network-v2)	52s
openraft-test-bench (nightly)	1m 5s
openraft-feature-test (nightly, serde)	54s
openraft-test (nightly, 30)	3m 30s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 1s
openraft-feature-test (nightly, single-term-leader)	55s
openraft-test (nightly, 0, single-term-leader)	3m 12s
examples (stable, raft-kv-memstore-singlethreaded)	52s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	51s
rt-monoio	45s
examples (stable, raft-kv-rocksdb)	8m 23s
examples (nightly, memstore)	1m 4s
stores (stores/memstore)	57s
examples (nightly, raft-kv-memstore)	2m 19s
Build (nightly, bench,serde,bt,singlethreaded)	56s
tests-feature-test (nightly)	3m 1s
stores (stores/rocksstore)	6m 11s
examples (nightly, raft-kv-memstore-network-v2)	1m 6s
tests-feature-test (nightly, single-term-leader)	3m 0s
stores (stores/sledstore)	1m 4s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 25s
tests-feature-test (nightly, loosen-follower-log-revert)	3m 1s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 7s
examples (nightly, raft-kv-rocksdb)	12m 19s
	1h 20m 14s

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