Refactor: save committed log id for examples #2888

Job	Run time
cluster-benchmark (cluster_benchmark)	46s
examples (stable, raft-kv-memstore)	1m 18s
examples (stable, raft-kv-rocksdb)	8m 9s
examples (nightly, raft-kv-memstore)	1m 19s
examples (nightly, raft-kv-rocksdb)	12m 0s
external-stores (stores/rocksstore-v2)	5m 59s
lint	1m 5s
openraft-feature-test (nightly)	51s
openraft-feature-test (nightly, serde)	52s
openraft-test (stable, 0)	2m 59s
openraft-feature-test (nightly, single-term-leader)	52s
openraft-test (nightly, 30)	3m 11s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	50s
openraft-test (nightly, 0, single-term-leader)	2m 57s
openraft-test-bench (nightly)	53s
stores (memstore)	50s
Build (nightly, bench,serde,bt,singlethreaded)	48s
stores (rocksstore)	6m 4s
tests-feature-test (nightly)	2m 41s
stores (rocksstore-compat07)	6m 12s
tests-feature-test (nightly, single-term-leader)	2m 43s
stores (sledstore)	54s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 43s
	1h 6m 56s

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