Return the Parliamentary constituency data in dictionary form

[nikhilwoodruff]

Fixes #2199

[codecov]

Codecov Report

Attention: Patch coverage is 4.34783% with 22 lines in your changes missing coverage. Please review.

Project coverage is 74.21%. Comparing base (69fb911) to head (7249a85).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
policyengine_api/endpoints/economy/compare.py	4.34%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2200      +/-   ##
==========================================
- Coverage   75.59%   74.21%   -1.39%     
==========================================
  Files          79       79              
  Lines        2934     3021      +87     
  Branches      311      331      +20     
==========================================
+ Hits         2218     2242      +24     
- Misses        651      714      +63     
  Partials       65       65              

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