feat: refactor function definitions in clj

[erdos]

• Refactor how functions are defined for stencil.
• Create automatically generated functions documentation from the source code.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.01%. Comparing base (0ab758d) to head (990cb59).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   93.78%   94.01%   +0.23%     
==========================================
  Files          30       30              
  Lines        2076     2090      +14     
  Branches       92       90       -2     
==========================================
+ Hits         1947     1965      +18     
+ Misses         37       35       -2     
+ Partials       92       90       -2     

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