Refactor: log significant events with `Display` #288

Job	Run time
cluster-benchmark (cluster_benchmark)	47s
examples (stable, memstore)	37s
examples (stable, raft-kv-memstore)	2m 26s
examples (stable, raft-kv-memstore-network-v2)	55s
lint	12m 20s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 24s
openraft-feature-test (nightly)	51s
openraft-feature-test (nightly, serde)	54s
examples (stable, raft-kv-memstore-singlethreaded)	59s
openraft-feature-test (nightly, single-term-leader)	1m 4s
examples (stable, raft-kv-rocksdb)	8m 41s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	54s
examples (nightly, memstore)	54s
examples (nightly, raft-kv-memstore)	2m 16s
examples (nightly, raft-kv-memstore-network-v2)	1m 20s
openraft-test (stable, 0)	3m 24s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 54s
openraft-test (nightly, 30)	3m 27s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 19s
openraft-test (nightly, 0, single-term-leader)	3m 14s
examples (nightly, raft-kv-rocksdb)	12m 23s
openraft-test-bench (nightly)	59s
stores (stores/memstore)	54s
stores (stores/rocksstore)	6m 19s
Build (nightly, bench,serde,bt,singlethreaded)	58s
stores (stores/sledstore)	1m 3s
tests-feature-test (nightly)	2m 56s
tests-feature-test (nightly, single-term-leader)	2m 56s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 58s
	1h 21m 6s

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