feat: add signet-rpc-storage crate with ETH RPC endpoints #388

Job	Run time
rust-library-base / Feature Checks	1m 13s
rust-library-base / Base Checks / Docs	42s
rust-library-base / Base Checks / Rustfmt	26s
rust-library-base / Base Checks / doctest	1m 5s
rust-library-base / Base Checks / Clippy	40s
rust-library-base / Base Checks / Test Suite	2m 30s
	6m 36s

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