all: simplify and fix database iteration with prefix/start (#20808)

* core/state/snapshot: start fixing disk iterator seek

* ethdb, rawdb, leveldb, memorydb: implement iterators with prefix and start

* les, core/state/snapshot: iterator fixes

* all: remove two iterator methods

* all: rename Iteratee.NewIteratorWith -> NewIterator

* ethdb: fix review concerns

core/state/iterator_test.go

@@ -51,7 +51,7 @@ func TestNodeIteratorCoverage(t *testing.T) {
 			t.Errorf("state entry not reported %x", hash)
 		}
 	}
-	it := db.TrieDB().DiskDB().(ethdb.Database).NewIterator()
+	it := db.TrieDB().DiskDB().(ethdb.Database).NewIterator(nil, nil)
 	for it.Next() {
 		key := it.Key()
 		if bytes.HasPrefix(key, []byte("secure-key-")) {