Add generic interface to change codegen params

[gbaraldi]

Adding new things every time a codegen_param gets added is problably getting old quite quickly, so add a generic interface for it.

[codecov[bot]]

Codecov Report

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

Comparison is base (1d58bff) 84.55% compared to head (7411e9f) 74.58%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
- Coverage   84.55%   74.58%   -9.97%     
==========================================
  Files          24       24              
  Lines        3309     3282      -27     
==========================================
- Hits         2798     2448     -350     
- Misses        511      834     +323     

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[maleadt]

CI failures don't occur on master so are likely related?