Add ForwardDiff package extension

[adrhill]

With #197, the ForwardDiff extension is now just one line of code:

eval(SCT.generate_code_2_to_1(:Base, SCT.ops_2_to_1, ForwardDiff.Dual))

Closes #196.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.91%. Comparing base (f70f532) to head (0c1226c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
+ Coverage   90.74%   90.91%   +0.16%     
==========================================
  Files          47       49       +2     
  Lines        2107     2113       +6     
==========================================
+ Hits         1912     1921       +9     
+ Misses        195      192       -3     

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[adrhill]

Somehow this PR causes some major recompilation issues.