Feature Request: SQLite Support

[ZepsiZola]

What is missing:

Support for SQLite storage with the inventory backups.

Specific changes to make:

When I make backups of my server, it takes a significantly long amount of time to archive the inventory backups. This is because of how many singular files there are for each player and their IR backups. Since there is already MySQL functionality with the plugin, surely it couldn't be that hard to implement SQLite. It's better than flat file storage mainly for the reason stated above. Plus I rarely, if ever, have actually needed to go into my IR backup .yml files and edit data which is the only upside I can see for using flat file storage for this.

Additional context:

Most plugins that give you the option of using MySQL also give you the option of using SQLite as a database. It's weird that the only 2 options here are MySQL or a ton of .yml files.