Refactor: RaftError: serde derive #2947

Job	Run time
openraft-test-bench (nightly)	44s
external-stores (stores/rocksstore-v2)	6m 22s
stores (memstore)	41s
stores (rocksstore)	6m 3s
openraft-test (stable, 0)	34s
Build (nightly, bench,serde,bt,singlethreaded)	47s
stores (rocksstore-compat07)	6m 39s
openraft-test (nightly, 30)	37s
stores (sledstore)	53s
openraft-test (nightly, 0, single-term-leader)	42s
cluster-benchmark (cluster_benchmark)	48s
examples (stable, raft-kv-memstore)	2m 8s
lint	6m 37s
examples (stable, raft-kv-memstore-singlethreaded)	1m 6s
openraft-feature-test (nightly)	38s
examples (stable, raft-kv-rocksdb)	8m 8s
openraft-feature-test (nightly, serde)	47s
examples (nightly, raft-kv-memstore)	2m 7s
tests-feature-test (nightly)	2m 43s
openraft-feature-test (nightly, single-term-leader)	40s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 16s
tests-feature-test (nightly, single-term-leader)	2m 24s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	50s
examples (nightly, raft-kv-rocksdb)	11m 46s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 40s
	1h 8m 40s

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