feat: add signet-host-reth crate with RethHostNotifier #564

Job	Run time
rust-library-base / Base Checks / Test Suite	4m 18s
rust-library-base / Base Checks / Rustfmt	33s
rust-library-base / Base Checks / doctest	2m 16s
rust-library-base / Base Checks / Clippy	1m 57s
rust-library-base / Base Checks / Docs	1m 50s
rust-library-base / Feature Checks	2m 13s
	13m 7s

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