patient / person API endpoints for retrieving data

[ericbuckley]

Description

Creating GET /person/<ref-id> and GET /patient/<ref-id> to retrieve info on the existing MPI data elements.

Related Issues

closes #162

Additional Notes

Adding a testing helper context manager to count database queries, hoping this can be useful when we want to make assertions on how many SQL queries are issued.

<--------------------- REMOVE THE LINES BELOW BEFORE MERGING --------------------->

Checklist

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• I have reviewed my changes to ensure they are clear, concise, and well-documented.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.68%. Comparing base (079bab7) to head (0401ab2).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
+ Coverage   97.65%   97.68%   +0.03%     
==========================================
  Files          32       32              
  Lines        1576     1599      +23     
==========================================
+ Hits         1539     1562      +23     
  Misses         37       37              

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[bamader]

LGTM!