Replace core__medicationrequest code with core__medication code

[mikix]

• core__medication no longer exists.
• coremedicationrequest now has all the "abstract where medications come from" logic that coremedication had and no longer retricts itself to just RxNorm.

Changes to the field list for core__medicationrequest:

• Dropped dosageInstruction_text, since no one was using it and the ETL strips the text anyway.
• Add reported_ref (to match reportedBoolean).
• Add category_display.

Fixes #227

Checklist

• [x] Consider if documentation (like in docs/) needs to be updated
• [x] Consider if tests should be added
• [x] Update template repo if there are changes to study configuration

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
1984	1961	99%	90%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
cumulus_library/studies/core/builder_medicationrequest.py	100%	🟢
TOTAL	100%	🟢

updated for commit: eb04a3a by action🐍