RPM Support

From https://projects.theforeman.org/issues/33216:

I recently ran into an issue while trying to sync a rhel 6.2 repo to my foreman server:

Artifact() got an unexpected keyword argument 'sha'

I saw a similar post here: https://projects.theforeman.org/issues/31559

The issue is marked as resolved for katello 3.18, yet I'm still having it with katello 4.1 and foreman 2.5.2

The error is as follow:

error"=>
     {"traceback"=>
       "  File \"/usr/lib/python3.6/site-packages/pulpcore/tasking/pulpcore_worker.py\", line 266, in _perform_task\n" +
       "    result = func(*args, **kwargs)\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulp_rpm/app/tasks/synchronizing.py\", line 422, in synchronize\n" +
       "    version = dv.create()\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulpcore/plugin/stages/declarative_version.py\", line 151, in create\n" +
       "    loop.run_until_complete(pipeline)\n" +
       "  File \"/usr/lib64/python3.6/asyncio/base_events.py\", line 484, in run_until_complete\n" +
       "    return future.result()\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulpcore/plugin/stages/api.py\", line 225, in create_pipeline\n" +
       "    await asyncio.gather(*futures)\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulpcore/plugin/stages/api.py\", line 43, in __call__\n" +
       "    await self.run()\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulp_rpm/app/tasks/synchronizing.py\", line 705, in run\n" +
       "    await self.parse_repository_metadata(repomd, repomd_files, file_extension)\n" +
       "  File \"/usr/lib/python3.6/site-packages/pulp_rpm/app/tasks/synchronizing.py\", line 800, in parse_repository_metadata\n" +
       "    artifact=Artifact(**file_data),\n" +
       "  File \"/usr/lib/python3.6/site-packages/django_lifecycle/mixins.py\", line 25, in __init__\n" +
       "    super().__init__(*args, **kwargs)\n" +
       "  File \"/usr/lib/python3.6/site-packages/django/db/models/base.py\", line 501, in __init__\n" +
       "    raise TypeError(\"%s() got an unexpected keyword argument '%s'\" % (cls.__name__, kwarg))\n",
      "description"=>"Artifact() got an unexpected keyword argument 'sha'"},