Implement MOI.Utilities.scalar_type for (Matrix|Sparse)VectorAffineFunction

[odow]

x-ref jump-dev/MathOptInterface.jl#2603

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.40%. Comparing base (07478f8) to head (4b5759e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/utils.jl	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #264      +/-   ##
==========================================
+ Coverage   85.38%   85.40%   +0.02%     
==========================================
  Files          12       12              
  Lines        1156     1158       +2     
==========================================
+ Hits          987      989       +2     
  Misses        169      169              

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