This option controls which database connector is used by Forge.
This must be set before forge is loaded. To use an alternative
connector you must install the respective package explicitly.
sqlite, then use the emacsql-sqlite library that is
being maintained in the same repository as emacsql itself.
libsqlite3, then use the emacsql-libsqlite library,
which itself uses a module provided by the sqlite3 package.
This is still experimental.
sqlite3, then use the emacsql-sqlite3 library, which
uses the official sqlite3 command-line tool, which I do not
recommended because it is not suitable to be used like this,
but has the advantage that you likely don’t need a compiler.
See https://nullprogram.com/blog/2014/02/06/.