primitives: use alloy KECCAK_EMPTY constant

[tcoratger]

No description provided.

[mattsse]

makes sense to trim all of these from the reth traits

we could however keep re-exporting the non chain specific constants from there

but i'd rather have a them in some constant crate eventually

[tcoratger]

makes sense to trim all of these from the reth traits

we could however keep re-exporting the non chain specific constants from there

but i'd rather have a them in some constant crate eventually

@mattsse So you mean doing something like?

/// Keccak256 over empty array: `0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470`
pub const KECCAK_EMPTY: B256 = alloy_consensus::constants::KECCAK_EMPTY;

Doesn't this add some overhead? I feel like direct imports from alloy_consensus are pretty smooth everywhere and alloy_consensus seems to be pretty much everywhere already. I'd say that removing the KECCAK_EMPTY declaration in reth entirely is in line with all the cleanup we've done on the primitives crate, right? But maybe I'm wrong :)