cuTENSOR plan handling changes.

[maleadt]

I don't like the naming scheme, but it's better to stay closer to the official cuTENSOR APIs, at least for the low-level functionality.

[codecov]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (a68f400) 71.44% compared to head (c0a01f3) 61.47%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
lib/cutensor/src/operations.jl	0.00%	30 Missing ⚠️
lib/cutensor/src/interfaces.jl	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2234      +/-   ##
==========================================
- Coverage   71.44%   61.47%   -9.97%     
==========================================
  Files         155      155              
  Lines       14628    14553      -75     
==========================================
- Hits        10451     8947    -1504     
- Misses       4177     5606    +1429     

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