feat(host-reth): replace ExEx backfill with direct DB reads #672

Job	Run time
rust-library-base / Feature Checks	5m 15s
rust-library-base / Base Checks / Test Suite	9m 6s
rust-library-base / Base Checks / doctest	5m 54s
rust-library-base / Base Checks / Docs	4m 26s
rust-library-base / Base Checks / Rustfmt	47s
rust-library-base / Base Checks / Dylint	7m 2s
rust-library-base / Base Checks / Clippy	4m 36s
	37m 6s

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