classifierext: add HEP ontology

* Adds the DESY maintained HEP ontology to classifier.

Co-authored-by: Kirsten Sachs <kirsten.sachs@desy.de>
Co-authored-by: Florian Schwennsen <florian.schwennsen@desy.de>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
global: assets 2.0

Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
workflows: add INSPIRE actions

* Adds INSPIRE specific actions for use with Holding Pen.

* Updates some parameters in the arXiv workflow tasks and
  workflow definitions.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: definition updates

* Changes workflow definitions to use new WorkflowBase superclass
  to have an interface for calling rendering functions for the
  Holding Pen.

Tested-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Guillaume Lastecoueres <guillaume.lastecoueres@cern.ch>
workflows: definition fix

* Fixes some missing imports in the workflow definitions.

* Implements rendering functions for the workflows.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: PEP8 updates

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>