lint

feat: improve sequencer metrics #1541

Job	Run time
check-toml	6s
fmt	18s
codespell	11s
docs	4m 27s
features	17m 6s
zepter	58s
udeps	4m 38s
no_std (riscv, riscv32imac-unknown-none-elf, scroll-engine,scroll-wire,rollup-node,scroll-network...	1m 20s
no_std (wasm, wasm32-unknown-unknown, scroll-engine,scroll-wire,rollup-node,scroll-network,rollup...	1m 16s
clippy	4m 24s
	34m 44s

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