Support for cch models

[larmarange]

fix #242

[codecov]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (457c028) 95.48% compared to head (73b897e) 94.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
- Coverage   95.48%   94.78%   -0.70%     
==========================================
  Files          43       43              
  Lines        2680     2706      +26     
==========================================
+ Hits         2559     2565       +6     
- Misses        121      141      +20     

Files	Coverage Δ
R/model_get_coefficients_type.R	85.41% <0.00%> (-1.82%)	⬇️
R/model_get_model_matrix.R	76.31% <0.00%> (-6.55%)	⬇️
R/model_get_terms.R	73.33% <25.00%> (-18.34%)	⬇️
R/custom_tidiers.R	84.37% <54.54%> (-2.21%)	⬇️
R/helpers.R	70.37% <0.00%> (-29.63%)	⬇️