Add bounds information in the macOS implementation

[albinekb]

On linux we could use xwininfo

$ xwininfo -id 0x340000a

xwininfo: Window id: 0x340000a "hyper@hyper-virtual-machine: ~"

  Absolute upper-left X:  65
  Absolute upper-left Y:  52
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 732
  Height: 410
  Depth: 32
  Visual: 0x76
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x3400009 (not installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +65+52  -3+52  -3-138  +65-138
  -geometry 80x24--7+14

[sindresorhus]

@albinekb Would you like me to merge this or should we wait on the Swift rewrite?

[albinekb]

Let's do the swift rewrite 👍 I can PR it tonight.

[albinekb]

Let's merge this now to get the info, and I'll start working on a swift rewrite with Codeable.