Refactor generate into a folder

[drhagen]

This moves deparse_to_taco into tensora.generate, which seems a more appropriate place for it.

[codecov-commenter]

Codecov Report

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

Comparison is base (7accc7b) 89.02% compared to head (b841a87) 89.05%.

Files	Patch %	Lines
src/tensora/generate/_taco.py	90.90%	1 Missing and 2 partials ⚠️
src/tensora/generate/_base.py	93.75%	0 Missing and 1 partial ⚠️
src/tensora/generate/_tensora.py	95.45%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
+ Coverage   89.02%   89.05%   +0.03%     
==========================================
  Files          51       54       +3     
  Lines        2933     2943      +10     
  Branches      524      524              
==========================================
+ Hits         2611     2621      +10     
  Misses        248      248              
  Partials       74       74              

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