feat(array): add to_reversed prototype method

[ivandevp]

Hey!

This PR adds Array.prototype.to_reversed method.

I tried to add a fast path similar to Array.prototype.reverse method but I wasn't able to figure out how to clone the array in order to not mutate the original array order. At least by doing array.clone() didn't work (it mutated the original array as well) and then the converting it to slice and back to an array triggers some issues between &[Option<Value>] and &[Value] that I couldn't find an easy fix - if we should add the fast path anyway, ideas are welcomed on how to implement it 🙏

[aapoalas]

Great job! Few minor issues, but all in all this is perfectly good to go.

Adding a fast path is possible, but requires a tad bit more involved work that touches on the Array's backing "elements heap vectors". This isn't too-too bad but requires a bit of work. I'll be happy to help if you want to take a stab at it.

[aapoalas]

Some errors leaked in but overall this is indeed exactly how the fast path should work. Nice work! <3

[aapoalas]

LGTM, and thank you for the work and for the patience! Great stuff, and the shallow clone helper function will be of great help in the future with other toCloned array prototype methods.

I left a few minor things that could be changed, the comment thing being most important. But otherwise this looks very much good to go! <3

[aapoalas]

Looks all good to me! Thank you very much, and sorry for the delay in reviewing! <3