Define simpler codepath for blockwise map

[mtfishman]

This defines a simpler codepath for map! when the blocking of the inputs are all the same, so then the mapping can be performed blockwise.

@ogauthe this should help with map operations when the blocks have Kronecker structures.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.15%. Comparing base (d360f75) to head (0f7f884).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
+ Coverage   73.90%   75.15%   +1.24%     
==========================================
  Files          29       29              
  Lines        1261     1284      +23     
==========================================
+ Hits          932      965      +33     
+ Misses        329      319      -10     

Flag	Coverage Δ
docs	13.45% <76.66%> (+1.59%)	⬆️

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