Generalize matmul, introduce disk and memory interface

[mtfishman]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.37500% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.61%. Comparing base (bf45ae4) to head (e97e8ea).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/SerializedArrays.jl	79.16%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   71.30%   72.61%   +1.30%     
==========================================
  Files           3        3              
  Lines         230      241      +11     
==========================================
+ Hits          164      175      +11     
  Misses         66       66              

Flag	Coverage Δ
docs	0.00% <0.00%> (ø)

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