use BlockedTuple in splitdims

[ogauthe]

Adapt BlockSparseArrays to the new TensorAlgebra.splitdims interface defined in ITensor/TensorAlgebra.jl#33

The new code removes the need for reducewhile.jl. I commented the include but did not delete the code as we may use it somewhere else or split it to its own library.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 24.79%. Comparing base (42ec520) to head (83c179a).

Files with missing lines	Patch %	Lines
...sorAlgebraExt/BlockSparseArraysTensorAlgebraExt.jl	0.00%	5 Missing ⚠️

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HEAD has 6 uploads less than BASE

Flag	BASE (42ec520)	HEAD (83c179a)
	6	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #55       +/-   ##
===========================================
- Coverage   75.15%   24.79%   -50.37%     
===========================================
  Files          30       29        -1     
  Lines        1111     1097       -14     
===========================================
- Hits          835      272      -563     
- Misses        276      825      +549     

Flag	Coverage Δ
docs	24.79% <0.00%> (+0.02%)	⬆️

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