Adds additional units and route to prescriptions

[rithviknishad]

Proposed Changes

• Adds support for additional units (mcg, unit(s)) to dosage fields.
• Adds additional choice Sublingual for route field of Prescription.

Associated Issue

• Prescription - improvement to dropdown  care_fe#8059
• FE: Adds additional units and route to prescriptions care_fe#8075

Architecture changes

• Remove this section if not used

Merge Checklist

• Tests added/fixed
• Linting Complete
• Any other necessary step

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.49%. Comparing base (1912662) to head (9f27b7c).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2290   +/-   ##
========================================
  Coverage    63.48%   63.49%           
========================================
  Files          238      238           
  Lines        13264    13265    +1     
  Branches      1886     1886           
========================================
+ Hits          8421     8422    +1     
  Misses        4490     4490           
  Partials       353      353           

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