Add a command to reset already uploaded files database

[pacoorozco]

**Is your feature request related to a problem? Sometimes you need to reset the already uploaded files database, in order to start uploading files from scratch. Currently you are forced to remove ~/.config/gphotos-uploader-cli/uploads.db folder.

Describe the solution you'd like It would be great to have a command that reset this database for you.

Describe alternatives you've considered First iteration can reset the whole database, but next iterations can use regexp of folders to reset only the files that match this regexp or folders.

Additional context Currently you can remove ~/.config/gphotos-uploader-cli/uploads.db to reset the database

Related: #49