eth: use slices package for sorting (#27490)

Also adds Hash.Less method for sorting purposes.

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Co-authored-by: Felix Lange <fjl@twurst.com>

common/types.go

@@ -65,6 +65,11 @@ func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
 // If b is larger than len(h), b will be cropped from the left.
 func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
 
+// Less compares two hashes.
+func (h Hash) Less(other Hash) bool {
+	return bytes.Compare(h[:], other[:]) < 0
+}
+
 // Bytes gets the byte representation of the underlying hash.
 func (h Hash) Bytes() []byte { return h[:] }