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

trie/iterator_test.go

@@ -120,7 +120,7 @@ func TestNodeIteratorCoverage(t *testing.T) {
 			}
 		}
 	}
-	it := db.diskdb.NewIterator()
+	it := db.diskdb.NewIterator(nil, nil)
 	for it.Next() {
 		key := it.Key()
 		if _, ok := hashes[common.BytesToHash(key)]; !ok {
@@ -312,7 +312,7 @@ func testIteratorContinueAfterError(t *testing.T, memonly bool) {
 	if memonly {
 		memKeys = triedb.Nodes()
 	} else {
-		it := diskdb.NewIterator()
+		it := diskdb.NewIterator(nil, nil)
 		for it.Next() {
 			diskKeys = append(diskKeys, it.Key())
 		}

trie/proof_test.go

@@ -106,7 +106,7 @@ func TestBadProof(t *testing.T) {
 			if proof == nil {
 				t.Fatalf("prover %d: nil proof", i)
 			}
-			it := proof.NewIterator()
+			it := proof.NewIterator(nil, nil)
 			for i, d := 0, mrand.Intn(proof.Len()); i <= d; i++ {
 				it.Next()
 			}

trie/sync_bloom.go

@@ -99,7 +99,7 @@ func (b *SyncBloom) init(database ethdb.Iteratee) {
 	// Note, this is fine, because everything inserted into leveldb by fast sync is
 	// also pushed into the bloom directly, so we're not missing anything when the
 	// iterator is swapped out for a new one.
-	it := database.NewIterator()
+	it := database.NewIterator(nil, nil)
 
 	var (
 		start = time.Now()
@@ -116,7 +116,7 @@ func (b *SyncBloom) init(database ethdb.Iteratee) {
 			key := common.CopyBytes(it.Key())
 
 			it.Release()
-			it = database.NewIteratorWithStart(key)
+			it = database.NewIterator(nil, key)
 
 			log.Info("Initializing fast sync bloom", "items", b.bloom.N(), "errorrate", b.errorRate(), "elapsed", common.PrettyDuration(time.Since(start)))
 			swap = time.Now()