"open in new window" should cascade instead of layering at same x/y

[bradleyrichter]

Test plan

1. Open Brave
2. Use the menu and pick File > New Window
3. A new window should appear and be offset (see example pics below). Offset should be ~20px

Original issue description

Cascade amount should be (x20px, y20px).

firefox example:

chrome example:

[alexwykoff]

similarly if you close and reopen brave, it would be wise to make sure we cascade.

[NejcZdovc]

Current findings:
We need to add some logic here https://github.com/brave/browser-laptop/blob/master/js/stores/appStore.js#L149

We need to check if user don't pass in any params about width/heigh we should cascade it.

Note that we also need to to change position when new position of cascaded is out of scope. We would like to do the same behavior as mac OS has. Move a finder window near to the window edge and create a new window. You will see that window is moved to another side where you have enough space. Same goes if you move it to the bottom it will be moved to the top if new window would be out site the scope.

[LaurenWags]

@bradleyrichter @NejcZdovc using 0.20.7 when you open enough windows that you get to the bottom of your screen, Brave keeps opening windows offset to the right, but Chrome does something different, see gifs below. Do we want to offset in the same way Chrome does? cc @kjozwiak @srirambv @luixxiul

Brave:

Chrome:

[bradleyrichter]

I thought I was witness to seeing the correct behavior in @NejcZdovc code. So it must be a new bug.

[LaurenWags]

Thanks @bradleyrichter - opened new issue for #8925 (comment) which is #12315