[TIMOB-18489] OptionDialogs have no way to specify the context window

Related to TC-5260. In that issue you can see how an OptionDialog, not attached to a view (and therefore not in _popover-mode_) will open as a modal view inside a window. In TC-5260 that window was (incorrectly) the Popover’s main window. However, once TC-5260 is resolved we will not be able to do that on purpose, that is creating a modal OptionDialog inside a specific window. I propose the addition of a targetWindow property to the showParams for the dialog.show({}) method, so we can explicitly tell where we want the dialog to attach.