Added 3D to 2D plotting along an axis/curve for general meshes

[FelipeSantillan]

This PR introduces the possibility to create 2D-plots from 3D-solutions when using a general mesh. It works similar to the Tree-mesh version. Here are some examples:

1. elixir: "structured_3d_dgsem\elixir_advection_basic" (with Gauss intitial condition)

Run simulation and use following lines to get a plot: using Plots; pd = PlotData2D(sol, slice=:yz, point=(0.1, 0.2, 0.3), nvisnodes=33); plot(pd);

2. elixir: "structured_3d_dgsem\elixir_advection_basic" (with Gauss intitial condition)

In the example above a "yz"-plane is used. The plane is give by x, y and z coordinates, which are each stored as a matrix. The y and z coordinates are bound to an equidistant grid and the x coordinates are all set to x=point[1]=0.1 . The x coordinates can be change by the additional input of a 'elevations' matrix. See the example below:

I want to slice the 3D-solution on a plane, which is deformed to a semi-sphere like this:

To do so, I use a small function to create a matrix 'elevations'. It holds the heights of the plot above and looks like this:

Finally, I just do: using Plots; pd = PlotData2D(sol, slice=:yz, elevetions=elevations); plot(pd);

As expected the plot is constant on the inside and is identical to the first examples in the corners.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.54930% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 96.73%. Comparing base (6d303b3) to head (5a03eec). Report is 604 commits behind head on main.

Files	Patch %	Lines
src/visualization/utilities.jl	86.67%	4 Missing :warning:
src/visualization/types.jl	95.12%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1099      +/-   ##
==========================================
- Coverage   96.75%   96.73%   -0.02%     
==========================================
  Files         303      303              
  Lines       23897    23939      +42     
==========================================
+ Hits        23120    23156      +36     
- Misses        777      783       +6     

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[FelipeSantillan]

For some reason StrideArrays fails to precompile. Other than that, I think this PR is ready to review.

[ranocha]

For some reason StrideArrays fails to precompile. Other than that, I think this PR is ready to review.

Yeah, there is an upstream issue for this (https://github.com/JuliaSIMD/StrideArrays.jl/issues/48).

[FelipeSantillan]

Thanks for reviewing my PR @ranocha . I will request another review once I have answered everything.