Remove partial scalar support

[drhagen]

Resolves #35

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (3d0b5a7) 88.91% compared to head (b8020b5) 89.02%.

Files	Patch %	Lines
src/tensora/function.py	25.00%	2 Missing and 1 partial ⚠️
src/tensora/compile.py	0.00%	1 Missing ⚠️
src/tensora/problem.py	83.33%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   88.91%   89.02%   +0.11%     
==========================================
  Files          52       51       -1     
  Lines        3012     2933      -79     
  Branches      529      524       -5     
==========================================
- Hits         2678     2611      -67     
+ Misses        258      248      -10     
+ Partials       76       74       -2     

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