Add bridge option which makes deep clones of objects instead of shallow clones

[UnexomWid]

The local object is backed up before entering a loop, and restored after the end of the loop. Therefore, any changes done to the local object inside the loop should not propagate.

[|# local.x = 5 |]

[|@ iterator : array |]
    [|# local.x = 1 |]
[| end |]

The local object remains unchanged after the loop. However, not in this case:

[|# local.x = { value: 10 } |]

[|@ iterator : array |]
    [|# local.x.value = 5 |]
[| end |]

In this case, local.x.value becomes 5, due to the fact that the backup is done using shallow copy in order to favor performance.

An option should be added, such that deep cloning is used instead. Of course, this may lead to a significant performance drop, but it's still good to have such an option available in case it is needed.