Update code generation utilities

[adrhill]

• renames utilities from overload_* to generate_code_*
• adds functions generate_code_X_to_Y that call both generate_code_gradient_X_to_Y and generate_code_hessian_X_to_Y
• update package extensions
• update documentation

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.44%. Comparing base (cb273a1) to head (7746e81).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
+ Coverage   90.42%   90.44%   +0.01%     
==========================================
  Files          44       44              
  Lines        2037     2041       +4     
==========================================
+ Hits         1842     1846       +4     
  Misses        195      195              

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