Add coefficient_type argument to add_bridge and remove_bridge

[odow]

Closes #3393

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8068620) 98.07% compared to head (1757f01) 98.07%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3394   +/-   ##
=======================================
  Coverage   98.07%   98.07%           
=======================================
  Files          34       34           
  Lines        4928     4928           
=======================================
  Hits         4833     4833           
  Misses         95       95           

Impacted Files	Coverage Δ
src/JuMP.jl	97.26% <100.00%> (ø)
src/constraints.jl	96.61% <100.00%> (+0.01%)	⬆️
src/optimizer_interface.jl	96.87% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[blegat]

value_type might be confusing with the value_type we're adding in #3377
In here, it's really the coefficient_type used with MOI.Utilities with functions

[odow]

Updated to coefficient_type.