perf: don't fetch from db in constructor

[daniel-codecov]

Don't let Feature make requests to database unless check_value() is called. This will help our tests in worker because they don't have access to django db unless we explicitly give it.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.24%. Comparing base (6dfe609) to head (2cb3da3).

❗ Current head 2cb3da3 differs from pull request most recent head cbe31fa. Consider uploading reports for the commit cbe31fa to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
- Coverage   92.24%   92.24%   -0.01%     
==========================================
  Files         115      115              
  Lines        7056     7053       -3     
  Branches     1651     1651              
==========================================
- Hits         6509     6506       -3     
  Misses        519      519              
  Partials       28       28              

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