fix: elements would lose some states like scroll position because of "virtual parent" optimization (#427)

* fix: elements would lose some state like scroll position because of "virtual parent" optimization

* refactor: the bugfix code

bug: elements would lose some state like scroll position because of "virtual parent" optimization

* fix: an error occured at applyMutation(remove nodes part)

error message:
Uncaught (in promise) DOMException: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node

typings/replay/index.d.ts

@@ -17,6 +17,7 @@ export declare class Replayer {
     private legacy_missingNodeRetryMap;
     private treeIndex;
     private fragmentParentMap;
+    private elementStateMap;
     private imageMap;
     constructor(events: Array<eventWithTime | string>, config?: Partial<playerConfig>);
     on(event: string, handler: Handler): this;
@@ -47,6 +48,8 @@ export declare class Replayer {
     private hoverElements;
     private isUserInteraction;
     private backToNormal;
+    private storeState;
+    private restoreState;
     private warnNodeNotFound;
     private warnCanvasMutationFailed;
     private debugNodeNotFound;

typings/types.d.ts

@@ -354,4 +354,7 @@ export declare enum ReplayerEvents {
     StateChange = "state-change"
 }
 export declare type MaskInputFn = (text: string) => string;
+export declare type ElementState = {
+    scroll?: [number, number];
+};
 export {};