Option for different position offsets for stacked windows whose size is constrained

[dev-msp]

In the special case where a window's actual size is constrained by the app or the OS to be smaller than that of the area it occupies (e.g. System Preferences), I feel that there's an opportunity for the user to configure how yabai positions the smaller window within the allotted window area.

I don't have a strong opinion about how to expose this, but it seems the most sensible solution would be a new rule argument. The docs would look something like:

YABAI(1)                                  Yabai Manual                                  YABAI(1)


DEFINITIONS
            [...]
            ALIGN_SEL := center | top_left | top_right | (...)
            [...]
DOMAINS
   Rule

   General Syntax
       yabai -m rule <COMMAND>

   ARGUMENT
       align=<ALIGN_SEL>
           Relative position for windows whose maximum size does not exceed their allotted area

   [...]

Yabai                                      2022-09-23                                   YABAI(1)