Bound info for parameter functions in disjunct constraints

[dnguyen227]

Right now if a disjunct contains a parameter function, any method that uses variable bounds will error when it comes across it.

ArgumentError: JuMP.has_lower_bound not defined for variable reference type ParameterFunctionRef

So in this PR set_variable_bound_info is given a dispatch for GeneralVariableRef.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.52%. Comparing base (a4ebe8a) to head (17543e5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #143   +/-   ##
=======================================
  Coverage   99.51%   99.52%           
=======================================
  Files          17       17           
  Lines        2061     2093   +32     
=======================================
+ Hits         2051     2083   +32     
  Misses         10       10           

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[dnguyen227]

@pulsipher ready for review 🙂

[pulsipher]

Is this problem removed by just defining methods like JuMP.lower_bound for parameter functions? If so, perhaps we just need to add this to InfiniteOpt...