cmd, core/state, eth, tests, trie: improve state reader (#27428)

The state availability is checked during the creation of a state reader.

-    In hash-based database, if the specified root node does not exist on disk disk, then
    the state reader won't be created and an error will be returned.

-    In path-based database, if the specified state layer is not available, then the
    state reader won't be created and an error will be returned.

This change also contains a stricter semantics regarding the `Commit` operation: once it has been performed, the trie is no longer usable, and certain operations will return an error.

core/state/pruner/pruner.go

@@ -420,7 +420,10 @@ func extractGenesis(db ethdb.Database, stateBloom *stateBloom) error {
 	if err != nil {
 		return err
 	}
-	accIter := t.NodeIterator(nil)
+	accIter, err := t.NodeIterator(nil)
+	if err != nil {
+		return err
+	}
 	for accIter.Next(true) {
 		hash := accIter.Hash()
 
@@ -441,7 +444,10 @@ func extractGenesis(db ethdb.Database, stateBloom *stateBloom) error {
 				if err != nil {
 					return err
 				}
-				storageIter := storageTrie.NodeIterator(nil)
+				storageIter, err := storageTrie.NodeIterator(nil)
+				if err != nil {
+					return err
+				}
 				for storageIter.Next(true) {
 					hash := storageIter.Hash()
 					if hash != (common.Hash{}) {