chore: impl Hash for Txenvelope

[mattsse]

use tx hash as hash, same as

alloy/crates/consensus/src/transaction/pooled.rs

Lines 278 to 282 in 356dc67

	impl Hash for PooledTransaction {
	fn hash<H: Hasher>(&self, state: &mut H) {
	self.trie_hash().hash(state);
	}
	}

[DaniPopes]

if the hash can be invalidated through mutation then this is incorrect

if not then equality should also be implemented like this

[mattsse]

max pain

[mattsse]

@DaniPopes impled hash for signed, mirroring partialeq and derived it for txenvelope instead