* feat(server): Google Pixel motion photos
Add support for motion photos taken on Pixel phones. They have the exif
property 'MotionPhoto' set to 1, and an embedded mp4 file appended to
the JPEG file.
The implementation works like this:
- on metadata extraction, if a live photo is detected, examine the
metadata to determine where in the file the embedded MP4 is.
- extract this MP4 and write it next to the JPEG.
- link it using the existing mechanism for live photos.
There is a "MotionPhotoPresentationTimestampUs" exif property, which we
don't do anything with - I imagine that it refers to the timepoint in
the video that the photo was taken at, but it probably warrants more
investigation.
* fix format
* fix test
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Co-authored-by: Alex Tran <alex.tran1502@gmail.com>
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