Optimize arrays and array operations

[jedel1043]

There are several things that we could improve in our implementation of arrays that should improve performance considerably.

• Array.prototype.unshift
• Array.prototype.splice
• Preserve dense arrays when removing properties at start and middle
• Element arrays

Some resources:

https://v8.dev/blog/elements-kinds

https://dev.to/puzpuzpuz/v8-deep-dives-understanding-array-internals-3jdf

https://www.dashlane.com/blog/how-is-data-stored-in-v8-js-engine-memory

[tkshsbcue]

hey @jedel1043 i hope you can have a look thanks!