feat: add signet-rpc-storage crate with ETH RPC endpoints #359

Job	Run time
rust-library-base / Feature Checks	2m 18s
rust-library-base / Base Checks / Docs	2m 12s
rust-library-base / Base Checks / Clippy	1m 21s
rust-library-base / Base Checks / Rustfmt	36s
rust-library-base / Base Checks / doctest	3m 36s
rust-library-base / Base Checks / Test Suite	3m 40s
	13m 43s

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