Homogeneous trial fe space from trial fe space

[oriolcg]

Modifications to enable the construction of an HomogeneousTrialFESpace from a TrialFESpace. This PR solves the issue gridap/GridapODEs.jl#37.

[codecov-commenter]

Codecov Report

Merging #384 into master will increase coverage by 1.12%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
+ Coverage   87.71%   88.83%   +1.12%     
==========================================
  Files         156      156              
  Lines       11010    10094     -916     
==========================================
- Hits         9657     8967     -690     
+ Misses       1353     1127     -226     

Impacted Files	Coverage Δ
src/CellData/CellFields.jl	86.91% <33.33%> (-3.04%)	⬇️
src/FESpaces/ExtendedFESpaces.jl	93.12% <100.00%> (-1.20%)	⬇️
src/FESpaces/FECellBases.jl	33.33% <0.00%> (-23.81%)	⬇️
src/Arrays/SubVectors.jl	80.00% <0.00%> (-20.00%)	⬇️
src/Integration/Quadratures.jl	70.00% <0.00%> (-11.82%)	⬇️
src/Arrays/ArrayPairs.jl	81.81% <0.00%> (-11.04%)	⬇️
src/TensorValues/SymFourthOrderTensorValueTypes.jl	64.44% <0.00%> (-10.56%)	⬇️
src/TensorValues/TensorValueTypes.jl	66.66% <0.00%> (-10.15%)	⬇️
src/FESpaces/DirichletFESpaces.jl	90.90% <0.00%> (-9.10%)	⬇️
src/TensorValues/SymTensorValueTypes.jl	56.71% <0.00%> (-8.57%)	⬇️
... and 122 more

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