Redistribute API rework

[JordiManyer]

Rework of the distributed Adaptivity + Redistribution toolset.

• [x] Bring RedistributeTools.jl from GridapSolvers/GridapP4est.
• [x] Create mock models and tests for Adaptivity/Redistribution.
• [ ] Bring FESpaces.jl from GridapP4est.
• [ ] Create tests for non-conforming adaptivity.

[codecov-commenter]

Codecov Report

Merging #120 (157ed1a) into partitioned_arrays_v0.3 (ac5a328) will not change coverage. Report is 1 commits behind head on partitioned_arrays_v0.3. The diff coverage is 0.00%.

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@@                   Coverage Diff                    @@
##           partitioned_arrays_v0.3    #120    +/-   ##
========================================================
  Coverage                     0.00%   0.00%            
========================================================
  Files                           10      12     +2     
  Lines                         1767    1938   +171     
========================================================
- Misses                        1767    1938   +171     

Files Changed	Coverage Δ
src/Adaptivity.jl	0.00% <0.00%> (ø)
src/FESpaces.jl	0.00% <0.00%> (ø)
src/Geometry.jl	0.00% <0.00%> (ø)
src/VoidTypes.jl	0.00% <0.00%> (ø)

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[amartinhuertas]

We will leave:

• [ ] Bring FESpaces.jl from GridapP4est.
• [ ] Create tests for non-conforming adaptivity.

for a different PR.