lint

feat: improve rpc namespace #1525

Job	Run time
clippy	4m 47s
docs	4m 27s
check-toml	9s
codespell	11s
features	3m 31s
fmt	16s
zepter	54s
udeps	3m 52s
no_std (riscv, riscv32imac-unknown-none-elf, scroll-engine,scroll-wire,rollup-node,scroll-network...	1m 13s
no_std (wasm, wasm32-unknown-unknown, scroll-engine,scroll-wire,rollup-node,scroll-network,rollup...	1m 19s
	20m 39s

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