Add tpss

[ruinbery]

: )

[ruinbery]

Ready for review.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 806 lines in your changes missing coverage. Please review.

Project coverage is 41.44%. Comparing base (06b2600) to head (bb92d38).
Report is 43 commits behind head on main.

Files with missing lines	Patch %	Lines
src/SpatialDiscretizations/tensor_split_simplex.jl	0.00%	743 Missing ⚠️
src/SpatialDiscretizations/multidimensional.jl	0.00%	52 Missing ⚠️
src/SpatialDiscretizations/tensor_simplex.jl	0.00%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #88       +/-   ##
===========================================
- Coverage   53.84%   41.44%   -12.40%     
===========================================
  Files          36       37        +1     
  Lines        2730     3520      +790     
===========================================
- Hits         1470     1459       -11     
- Misses       1260     2061      +801     

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