Support GaussSBP shock capturing on curved meshes

[jlchan]

Adds support for curved meshes.

[codecov]

Codecov Report

Merging #1478 (921e4ae) into main (fa04120) will increase coverage by 2.75%.
The diff coverage is 91.43%.

❗ Current head 921e4ae differs from pull request most recent head 7b3dcce. Consider uploading reports for the commit 7b3dcce to get more accurate results

@@            Coverage Diff             @@
##             main    #1478      +/-   ##
==========================================
+ Coverage   92.94%   95.69%   +2.75%     
==========================================
  Files         359      360       +1     
  Lines       29779    29812      +33     
==========================================
+ Hits        27677    28527     +850     
+ Misses       2102     1285     -817     

Flag	Coverage Δ
unittests	95.69% <91.43%> (+2.75%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/solvers/dgmulti/shock_capturing.jl	90.36% <90.32%> (-0.15%)	⬇️
...s/dgmulti_2d/elixir_euler_shockcapturing_curved.jl	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

[ranocha]

Thanks!