feat(ecmascript): array and object assignment pattern

[kermanx]

This PR adds support for array and object assignment pattern.

TODO: Object assignment pattern's rest part. (I am not sure how to design it. The existing implementation of object binding pattern requires many special instructions, but are they also required in Object assignment pattern?)

[aapoalas]

Wow, amazing work, figuring out how the bytecode compiler works and especially how on earth all the assignment expressions work, those complicated devils!

How did you like the bytecode work? I've always found it pretty fun and amazing, how the small instructions come together to form something great. I look forward to one day maybe making an optimising compiler out of this all :)

I'm perfectly happy to merge this as-is; I did leave one or two nitpicks and suggestions, if you want to take those up. Also, if you want to still finish up some of the remaining todo!'s then that's fine as well. Let me know how you want to go forward with this, and thank you <3

[kermanx]

Thank you for reviewing~

Also, if you want to still finish up some of the remaining todo!'s then that's fine as well. Let me know how you want to go forward with this, and thank you <3

At the moment I mostly choose what to do at random. In the future I would like to do things that improve performance :)