[collect] Implement a way to collect media file meta information

[sveetch]

Just like directory has a manifest to include some meta information to collect, each collected media files should also be able to have meta information.

• First subject is how and where these meta information should be stored to be collected;
• Then what kind of information could be present. It should probably like for directory (anything except forbidden/reserved words);

[sveetch]

As additional context this is required to collect information on movies since they are commonly stored as a single video file, opposed to TV shows that can have their own directory to store multiple episode files.

[sveetch]

With have this Gist which demonstrates how it is easy to collect data from the video file itself: https://gist.github.com/sveetch/0973050c97b2df4dc34d416cfe3b96ef

However this won't be able to manage strict non-video data like title, genre or kind (tv, movie, etc..).