improve rrdom performance (#1127)

* add more check to rrdom to make diff algorithm more robust

* fix: selector match in iframe is case-insensitive

add try catch to some fragile points

* test: increase timeout value for Jest

* improve code style

* fix: failed to execute insertBefore on Node in the diff function

this happens when ids of doctype or html element are changed in the virtual dom

also improve the code quality

* refactor diff function to make the code cleaner

* fix: virtual nodes are passed to plugin's onBuild function

* refactor the diff function and adjust the order of diff work.

* call afterAppend hook in a consistent traversal order

* improve the performance of the "contains" function

reduce the complexity from O(n) to O(logn)
a specific benchmark is needed to add further

* add a real events for benchmark

* refactor: change the data structure of childNodes from array to linked list

* remove legacy code in rrweb package

* update unit tests

* update change log

packages/rrdom/src/index.ts

@@ -131,7 +131,8 @@ export class RRDocument extends BaseRRDocumentImpl(RRNode) {
   }
 
   destroyTree() {
-    this.childNodes = [];
+    this.firstChild = null;
+    this.lastChild = null;
     this.mirror.reset();
   }