Add osxphotos match command

[RhetTbull]

Add a command to match a file or files on disk with assets in Photos.

New command would get fingerprint for files on disk and find assets in the library that match the asset on disk. This would be useful as an import check (like osxphotos import --check) but could also be used to run an arbitrary function. Function would be passed the path to the file on disk and a PhotoInfo object for the matching asset(s). (Or list of PhotoInfo as more than one could match)

Add options to run a command or function on matching files and a command or function on non-matching files.

See for example generate_sidecars.py which could be implanted as a user function if this command existed.