Support vector-valued constraints in normalized_coefficient

[odow]

Closes #3742

One naming question:

We actually have set_normalized_coefficiets for this case:
https://jump.dev/JuMP.jl/stable/api/JuMP/#set_normalized_coefficients

So we should probably either call this normalized_coefficients, or rename set_normalized_coefficients to set_normalized_coefficient (but leave the current method for backwards compatibility).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.38%. Comparing base (18c01c4) to head (c3b4c3c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3743   +/-   ##
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  Coverage   98.37%   98.38%           
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  Files          44       44           
  Lines        5857     5866    +9     
=======================================
+ Hits         5762     5771    +9     
  Misses         95       95           

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