[Draft] Support FastDifferentiation.jl as symbolic AD backend and parametric bounds

[lassepe]

Draft; do not merge.

• Requires Fix code generation in the presence of constants and zeros brianguenter/FastDifferentiation.jl#43
• Waiting for Non-unique path assertion in follow_path brianguenter/FastDifferentiation.jl#40

Todos

• rebase
• go over in-code TODO's
• Split out parametric bounds feature
• improve dispatch logic
• add tests
• update gradient rule to account for derivative in bounds
• tag a breaking release

[codecov]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (00807b2) 91.59% compared to head (43cf3de) 72.84%.

❗ Current head 43cf3de differs from pull request most recent head 86afb7d. Consider uploading reports for the commit 86afb7d to get more accurate results

Files	Patch %	Lines
src/parametric_problem.jl	0.00%	32 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #14       +/-   ##
===========================================
- Coverage   91.59%   72.84%   -18.75%     
===========================================
  Files           5        5               
  Lines         119      151       +32     
===========================================
+ Hits          109      110        +1     
- Misses         10       41       +31     

Flag	Coverage Δ
unittests	72.84% <0.00%> (-18.75%)	⬇️

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