Start handling abstract block types

[mtfishman]

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[codecov]

Codecov Report

Attention: Patch coverage is 91.83673% with 4 lines in your changes missing coverage. Please review.

Project coverage is 73.97%. Comparing base (89faa55) to head (4bbdb8f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/blocksparsearrayinterface/map.jl	81.81%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #150      +/-   ##
==========================================
- Coverage   75.02%   73.97%   -1.06%     
==========================================
  Files          36       36              
  Lines        1838     1875      +37     
==========================================
+ Hits         1379     1387       +8     
- Misses        459      488      +29     

Flag	Coverage Δ
docs	7.80% <46.93%> (+0.28%)	⬆️

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