Support change-array-by-copy tc39 proposal

[entropitor]

Suggestion

Support https://github.com/tc39/proposal-change-array-by-copy (stage 3 proposal).

Adding

    Array.prototype.toReversed() -> Array
    Array.prototype.toSorted(compareFn) -> Array
    Array.prototype.toSpliced(start, deleteCount, ...items) -> Array
    Array.prototype.with(index, value) -> Array


    TypedArray.prototype.toReversed() -> TypedArray
    TypedArray.prototype.toSorted(compareFn) -> TypedArray
    TypedArray.prototype.with(index, value) -> TypedArray

[robpalme]

This proposal went to Stage 4 yesterday. It looks like there's already a PR in progress. Please say if further help is needed.