Start utPLSQL tests with an arbitrary utPLSQL path

[PhilippSalvisberg]

The extension for PL/SQL Developer allows running utPLSQL for an arbitrary utPLSQL path. Here's the screenshot:

This allows e.g. to include/exclude tags which is currently not possible in the SQL Developer extension.

I think we should add something similar to the utPLSQL extension. Maybe even help build the path, e.g. via a list of discovered tags.