GitLab

Integrate access term labels.
Refactor translation mappers.
Refactor dependency structure to enable mockking.
Add mockked elasticsearch wrapper.

Improve logging for missing record sets & institutions in records.

- Remove empty lists from more objects
- Extract JSON parse functions
- Add enriched digital metadata
- Add aspect ratio
- Add more failsafes for missing data.

Fix carrier type map.
Refactor helper functions [WIP]
Document helper functions [WIP]
Improve logging for helper functions [WIP]
Update tests

Added ability to add source field alternatives to entity transforms
with conditional target.

If the array is just string then return strings!