Change interface of model building blocks to be method based

[Maximilian-Stefan-Ernst]

No description provided.

[codecov]

Codecov Report

Merging #96 (a77c51d) into devel (e6b5bbf) will increase coverage by 0.59%.
The diff coverage is 75.25%.

@@            Coverage Diff             @@
##            devel      #96      +/-   ##
==========================================
+ Coverage   63.66%   64.25%   +0.59%     
==========================================
  Files          47       48       +1     
  Lines        2122     2395     +273     
==========================================
+ Hits         1351     1539     +188     
- Misses        771      856      +85     

Impacted Files	Coverage Δ
src/imply/empty.jl	0.00% <0.00%> (ø)
src/frontend/fit/standard_errors/hessian.jl	61.90% <25.00%> (-4.77%)	⬇️
src/frontend/specification/Sem.jl	43.39% <25.00%> (+0.12%)	⬆️
src/objective_gradient_hessian.jl	52.63% <52.63%> (ø)
src/loss/regularization/ridge.jl	47.61% <62.50%> (-19.05%)	⬇️
src/imply/RAM/generic.jl	79.62% <79.16%> (-2.98%)	⬇️
src/loss/constant/constant.jl	50.00% <83.33%> (ø)
src/loss/ML/ML.jl	85.71% <85.57%> (-3.40%)	⬇️
src/optimizer/optim.jl	70.27% <85.71%> (+2.41%)	⬆️
src/imply/RAM/symbolic.jl	86.48% <94.11%> (+0.21%)	⬆️
... and 9 more

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