FEAT: Add API for getting Neuronpedia feature

[hijohnnylin]

• Gets feature data from neuronpedia, including top activations
• Includes simple test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.73%. Comparing base (eea7db4) to head (e78207d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
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  Coverage   56.73%   56.73%           
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  Files          16       16           
  Lines        1366     1366           
  Branches      218      218           
=======================================
  Hits          775      775           
  Misses        552      552           
  Partials       39       39           

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