Extend TensorAlgebra's twist! instead of owning the generic function

[mtfishman]

Summary

Moves the AbstractArray fallback to TensorAlgebra and makes the GradedArray and UniqueSectorArray methods extend TA.twist!, so a package that cannot depend on GradedArrays can still reach the twist through the TensorAlgebra interface.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.53%. Comparing base (7be16c3) to head (a59519b).

Files with missing lines	Patch %	Lines
src/uniquesectorarray.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
- Coverage   85.53%   85.53%   -0.01%     
==========================================
  Files          40       40              
  Lines        2821     2820       -1     
==========================================
- Hits         2413     2412       -1     
  Misses        408      408              

Flag	Coverage Δ
docs	18.61% <0.00%> (+<0.01%)	⬆️

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