feat: add signet-rpc-storage crate with ETH RPC endpoints #373

Job	Run time
rust-library-base / Base Checks / doctest	2m 6s
rust-library-base / Feature Checks	1m 24s
rust-library-base / Base Checks / Rustfmt	37s
rust-library-base / Base Checks / Clippy	1m 30s
rust-library-base / Base Checks / Docs	2m 16s
rust-library-base / Base Checks / Test Suite	3m 47s
	11m 40s

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