Add endpoint to retrieve a worker version providing an Arkindex feature

arkindex/documents/fixtures/data.json

arkindex/documents/management/commands/build_fixtures.py

arkindex/process/api.py

arkindex/process/managers.py

arkindex/process/tests/test_worker_types.py

...ex/process/tests/worker_versions/test_retrieve_feature.py

arkindex/process/tests/workers/test_list.py

arkindex/project/api_v1.py