Update constructors

[mtfishman]

This updates the constructors for DiagonalArray to match the new style and interfaces of SparseArrayDOK (ITensor/SparseArraysBase.jl#43) and BlockSparseArray (ITensor/BlockSparseArrays.jl#68).

[codecov]

Codecov Report

Attention: Patch coverage is 57.57576% with 14 lines in your changes missing coverage. Please review.

Project coverage is 80.50%. Comparing base (ccd35c2) to head (4d4ccd4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/diagonalarray/diagonalarray.jl	57.57%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
- Coverage   80.51%   80.50%   -0.02%     
==========================================
  Files          11       11              
  Lines         154      159       +5     
==========================================
+ Hits          124      128       +4     
- Misses         30       31       +1     

Flag	Coverage Δ
docs	66.24% <51.51%> (+0.45%)	⬆️

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