Add variable inheritance in declarations

[nikhilwoodruff]

No description provided.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (9994ced) 82.46% compared to head (59bfc41) 82.55%.
Report is 6 commits behind head on master.

Files	Patch %	Lines
tests/core/variables/test_variables.py	94.73%	3 Missing ⚠️
policyengine_core/variables/variable.py	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
+ Coverage   82.46%   82.55%   +0.08%     
==========================================
  Files         185      185              
  Lines        8903     9000      +97     
  Branches     1125     1129       +4     
==========================================
+ Hits         7342     7430      +88     
- Misses       1295     1301       +6     
- Partials      266      269       +3     

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