Non-constant f in Enzyme

[gdalle]

DI extensions

• Remove Const annotation on f.
  • Downside: performance loss in most cases
  • Upside: allows closures and thus second order

DI tests

• Test this

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 89.08%. Comparing base (0b7a2f9) to head (3364518).

Files	Patch %	Lines
...ifferentiationInterfaceEnzymeExt/reverse_onearg.jl	0.00%	7 Missing ⚠️
...ifferentiationInterfaceEnzymeExt/forward_onearg.jl	0.00%	2 Missing ⚠️
...ifferentiationInterfaceEnzymeExt/reverse_twoarg.jl	0.00%	2 Missing ⚠️
...ifferentiationInterfaceEnzymeExt/forward_twoarg.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #309      +/-   ##
==========================================
- Coverage   96.32%   89.08%   -7.24%     
==========================================
  Files          95       93       -2     
  Lines        4294     4262      -32     
==========================================
- Hits         4136     3797     -339     
- Misses        158      465     +307     

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