Add a name field on data sources

mentioned in merge request frontend!254 (merged)

Codecov Report

Merging #490 into master will decrease coverage by 0.01%. The diff coverage is 76.66%.

@@            Coverage Diff             @@
##           master     #490      +/-   ##
==========================================
- Coverage   83.03%   83.01%   -0.02%     
==========================================
  Files         202      203       +1     
  Lines       11747    11775      +28     
==========================================
+ Hits         9754     9775      +21     
- Misses       1993     2000       +7

Impacted Files	Coverage Δ
...ex/documents/management/commands/build_fixtures.py	0% <ø> (ø)
arkindex/documents/tests/test_moderation.py	100% <ø> (ø)
arkindex/documents/serializers/ml.py	95.12% <ø> (ø)
...index/documents/tests/test_transcription_create.py	100% <100%> (ø)
arkindex/documents/tests/test_entities_api.py	100% <100%> (ø)
arkindex/documents/tests/test_datasource.py	100% <100%> (ø)
...kindex/documents/tests/test_bulk_classification.py	100% <100%> (ø)
arkindex/documents/tests/test_regions.py	100% <100%> (ø)
arkindex/documents/models.py	34.2% <50%> (+0.09%)
...index/documents/migrations/0022_datasource_name.py	69.23% <69.23%> (ø)
... and 1 more

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merged

mentioned in commit 99f3991c