Add support for stacking "original" and "cover" images from Google's naming for camera images

[Xaero252]

Is your feature request related to a problem? Please describe.
There was a feature request some time ago that has been closed (#1045) which stacks the RAW *.dng file and the associated JPG when the two files share the same name. This feature is great, but recent Google camera apps will save the original with the following structure:

PXL_(date)_(time).RAW-01.COVER.jpg      (this being the compressed JPEG file)
PXL_(date)_(time).RAW-02.ORIGINAL.dng   (this being the raw file)

Describe the solution you'd like
I think the idea of "stacking" the raw and compressed images is great, that way I don't see two of each image, and I can share the JPG and keep the DNG around for editing without visual clutter.

Describe alternatives you've considered
Somehow convincing Google that naming the photo output this way is archaic and we should just share the entire filename except the extension.

Additional context
This is something likely currently unique to pixel phone users, but could see this being somehow committed upstream into AOSP and then being adopted across multiple vendors.