cli: Set default verbosity for missing import messages:

Missing import messages now only display when verbosity is >= 2, this is to avoid
polluting the output. Dependency may be missing because user has not installed all
optional packages, the display should not show that every time.

libervia/cli/base.py

@@ -644,6 +644,7 @@ class LiberviaCli:
                         _("Can't import {module_path} plugin, ignoring it: {e}").format(
                             module_path=module_path, e=e
                         ),
+                        verbosity=2,
                         error=True,
                     )