Refactor Transformation API

[pulsipher]

This seeks to address #105. This constitutes a large undertaking and will take sometime to get right. Once completed, it should open the way up to resolve many of the existing issues.

[codecov]

Codecov Report

Merging #248 (7637c4b) into master (ba79f48) will decrease coverage by 99.78%.
The diff coverage is 0.00%.

❗ Current head 7637c4b differs from pull request most recent head 562257d. Consider uploading reports for the commit 562257d to get more accurate results

@@            Coverage Diff             @@
##           master    #248       +/-   ##
==========================================
- Coverage   99.77%   0.00%   -99.78%     
==========================================
  Files          36      35        -1     
  Lines        7103    6783      -320     
==========================================
- Hits         7087       0     -7087     
- Misses         16    6783     +6767     

Impacted Files	Coverage Δ
src/TranscriptionOpt/derivatives.jl	0.00% <0.00%> (ø)
src/TranscriptionOpt/measures.jl	0.00% <0.00%> (-100.00%)	⬇️
src/TranscriptionOpt/supports.jl	0.00% <0.00%> (ø)
src/array_parameters.jl	0.00% <0.00%> (-99.80%)	⬇️
src/constraints.jl	0.00% <0.00%> (-100.00%)	⬇️
src/datatypes.jl	0.00% <0.00%> (-100.00%)	⬇️
src/derivatives.jl	0.00% <0.00%> (-99.54%)	⬇️
src/expressions.jl	0.00% <0.00%> (-99.68%)	⬇️
src/finite_variables.jl	0.00% <0.00%> (-100.00%)	⬇️
src/general_variables.jl	0.00% <ø> (-100.00%)	⬇️
... and 14 more

... and 15 files with indirect coverage changes

[pulsipher]

Some plans on this were shared at https://www.youtube.com/watch?v=4DwpaqxAKwU

[pulsipher]

This has been partially resolved by #349. However, this PR provides some ideas on how to provide an incremental interface for transformation backend attributes that correspond to InfiniteModel objects.