crypto/kzg4844: add helpers for versioned blob hashes (#28827)

The code to compute a versioned hash was duplicated a couple times, and also had a small
issue: if we ever change params.BlobTxHashVersion, it will most likely also cause changes
to the actual hash computation. So it's a bit useless to have this constant in params.

eth/downloader/queue.go

@@ -29,6 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/prque"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/params"
@@ -810,7 +811,7 @@ func (q *queue) DeliverBodies(id string, txLists [][]*types.Transaction, txListH
 					return errInvalidBody
 				}
 				for _, hash := range tx.BlobHashes() {
-					if hash[0] != params.BlobTxHashVersion {
+					if !kzg4844.IsValidVersionedHash(hash[:]) {
 						return errInvalidBody
 					}
 				}