Remove ForwardDiff extension

[adrhill]

This package reverts #200 for the reasons described here:

With #200, ForwardDiff.Dual are treated just like any other Real number, meaning that multiplication with a global tracer basically ignores the ForwardDiff.Dual. However, ForwardDiff.Dual could in theory contain SCT's tracers (either in the primal value, in the partials, or in both), thus returning wrong, non-conservative sparsity patterns.

While this is a general issue with Real number wrapper types, I feel like adding a ForwardDiff extension would signal full support for ForwardDiff.Dual. I therefore suggest reverting the changes in #200.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.74%. Comparing base (bb7d365) to head (10154d7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
- Coverage   90.91%   90.74%   -0.17%     
==========================================
  Files          49       47       -2     
  Lines        2113     2107       -6     
==========================================
- Hits         1921     1912       -9     
- Misses        192      195       +3     

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