Replacing `ComponentArrays` with `NamedArrayPartition`

[jlchan]

The motivation for this is to be able to have an ArrayPartition-like storage of data in separate arrays while retaining a ComponentArrays-like access via getproperty to each of these separate array pieces. This allows us to do two things that we could not with ComponentArrays:

• use FillArrays to reduce the memory consumption of cut cell meshes (since many of the geometric terms are constant or zero)
• have the subarrays be StructArrays. ComponentArrays does not currently allow a one-level recursive structure - there are ways around this but not ones which retain the features of StructArrays to access the original contiguous components.

[codecov[bot]]

Codecov Report

Merging #66 (6048c49) into main (a6e8684) will decrease coverage by 65.03%. The diff coverage is 78.16%.

@@             Coverage Diff             @@
##             main      #66       +/-   ##
===========================================
- Coverage   97.26%   32.22%   -65.04%     
===========================================
  Files          19       20        +1     
  Lines        2193     2228       +35     
===========================================
- Hits         2133      718     -1415     
- Misses         60     1510     +1450     

Impacted Files	Coverage Δ
src/StartUpDG.jl	100.00% <ø> (+100.00%)	:arrow_up:
src/hybrid_meshes.jl	0.00% <0.00%> (-98.24%)	:arrow_down:
src/state_redistribution.jl	95.03% <62.50%> (ø)
src/cut_cell_meshes.jl	98.77% <100.00%> (ø)
src/named_array_partition.jl	100.00% <100.00%> (ø)
src/nonconforming.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/boundary_utils.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/explicit_timestep_utils.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/mesh/triangulate_example_meshes.jl	0.00% <0.00%> (-100.00%)	:arrow_down:
src/geometric_functions.jl	0.00% <0.00%> (-98.25%)	:arrow_down:
... and 11 more

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