Construct DiagonalArray and delta from axes

[mtfishman]

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[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.66%. Comparing base (1de5527) to head (0fec2da).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/diagonalarray/diagonalarray.jl	90.90%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   83.42%   91.66%   +8.24%     
==========================================
  Files          11       11              
  Lines         181      216      +35     
==========================================
+ Hits          151      198      +47     
+ Misses         30       18      -12     

Flag	Coverage Δ
docs	46.94% <2.63%> (-9.24%)	⬇️

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