The installation and usage process should be optimized

In order to better enable the plug-in to be used by users, whether to switch to SQLite should be made optional in the plug-in function.

step 1, install the plug-in

step 2, you can migrate the existing mysql database and convert the database to sqlite database

step3, switch the database to sqlite

step4, you can synchronize the new and synchronized data back to mysql, so that users can choose to switch back to mysql again without losing data.

I believe that if there is no risk for users to switch, more people will try and switch to SQLite instead of switching back to MySQL. This will also allow the WordPress core to really put this function into the core.