Hessian for skeleton triangulations

[zjwegert]

Currently, Hessian's cannot be computed on skeleton triangulations. Initial changes are WIP and should not be merged.

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.75%. Comparing base (e8e64da) to head (cd97062).
⚠️ Report is 44 commits behind head on master.

Files with missing lines	Patch %	Lines
src/FESpaces/FEAutodiff.jl	34.37%	42 Missing ⚠️
src/CellData/DomainContributions.jl	77.77%	2 Missing ⚠️
src/MultiField/MultiFieldAutodiff.jl	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1310      +/-   ##
==========================================
- Coverage   88.87%   88.75%   -0.13%     
==========================================
  Files         228      228              
  Lines       29988    30215     +227     
==========================================
+ Hits        26653    26818     +165     
- Misses       3335     3397      +62     

Flag	Coverage Δ
drivers	39.31% <27.61%> (-0.22%)	⬇️
extensions	4.99% <0.00%> (-0.04%)	⬇️
unit-adaptivity	39.93% <7.61%> (+0.17%)	⬆️
unit-basics	14.37% <13.46%> (-0.11%)	⬇️
unit-celldata	20.81% <8.57%> (-0.15%)	⬇️
unit-fespaces-1	32.57% <15.23%> (-0.24%)	⬇️
unit-fespaces-2	39.28% <37.14%> (-0.09%)	⬇️
unit-fields	17.44% <0.00%> (-0.14%)	⬇️
unit-geometry	28.34% <2.85%> (-0.19%)	⬇️
unit-multifield	30.38% <47.61%> (-0.25%)	⬇️
unit-odes	28.28% <22.85%> (-0.20%)	⬇️
unit-referencefes	33.84% <2.85%> (-0.26%)	⬇️
unit-visualization	11.65% <0.00%> (-0.09%)	⬇️

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