Add "Align Carets"

[cpmcgrath]

Visual Studio Column Selection is different to most implementations. When I first experienced it, I hated it, but when you start using it a bit, it's actually really awesome.

Visual Studio Code doesn't have virtual white space. As such if you do a column selection then press the "End" key, your carets don't line up:

This is actually really powerful. But it would be nice to have a shortcut to align them:

This can be achieved at the moment by typing a random string (the tilda key (`) is usually good enough) aligning by that and then deleting it.