* 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
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