feat: add signet-rpc-storage crate with ETH RPC endpoints #374

Job	Run time
rust-library-base / Feature Checks	46s
rust-library-base / Base Checks / Test Suite	2m 40s
rust-library-base / Base Checks / Docs	37s
rust-library-base / Base Checks / Clippy	34s
rust-library-base / Base Checks / doctest	1m 3s
rust-library-base / Base Checks / Rustfmt	15s
	5m 55s

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