Allow broadcasting in callbacks

[odow]

x-ref jump-dev/CPLEX.jl#354
x-ref jump-dev/Gurobi.jl#394

[codecov]

Codecov Report

Merging #172 (8447c54) into master (d33702a) will decrease coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   84.56%   84.37%   -0.19%     
==========================================
  Files           8        8              
  Lines        1503     1504       +1     
==========================================
- Hits         1271     1269       -2     
- Misses        232      235       +3     

Impacted Files	Coverage Δ
src/MOI_wrapper/MOI_wrapper.jl	91.82% <100.00%> (+<0.01%)	⬆️
src/MOI_wrapper/MOI_callbacks.jl	94.11% <0.00%> (-2.36%)	⬇️
src/gen/libglpk_api.jl	52.81% <0.00%> (-0.36%)	⬇️

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