feat: add signet-rpc-storage crate with ETH RPC endpoints #351

Job	Run time
rust-library-base / Base Checks / doctest	50s
rust-library-base / Base Checks / Clippy	35s
rust-library-base / Feature Checks	38s
rust-library-base / Base Checks / Docs	31s
rust-library-base / Base Checks / Rustfmt	16s
rust-library-base / Base Checks / Test Suite	2m 46s
	5m 36s

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