which determines if a filter is applied directly (RUN_NONINTERACTIVE)
or asynchronously using GimpOperationTool (RUN_INTERACTIVE).

Split filter actions in two groups, one for direct apply and one for
interactive apply, which have separate callbacks that create
GimpGeglProcedures with the right default_run_mode set.

(After doing this distinction automatically based on the existance of
editable properties, I figured will might want direct apply also for
filters that do have properties, such as e.g. dilate and erode, which
are just value-propagate with some constant property values)