feat: add signet-rpc-storage crate with ETH RPC endpoints #390

Job	Run time
rust-library-base / Feature Checks	45s
rust-library-base / Base Checks / Clippy	40s
rust-library-base / Base Checks / Docs	2m 25s
rust-library-base / Base Checks / doctest	1m 5s
rust-library-base / Base Checks / Test Suite	5m 30s
rust-library-base / Base Checks / Rustfmt	34s
	10m 59s

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