Add bound queries for finite parameters and parameter functions - #443

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.72%. Comparing base (467c671) to head (fef067f).

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  Files          39       39           
  Lines        6830     6834    +4     
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+ Hits         6811     6815    +4     
  Misses         19       19           

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I am in favor of adding the queries for finite parameters, but I don't think adding a bound API for parameter functions is the right way to go. It doesn't have much use outside of the niche use case of InfiniteGDPs with Hull. Moreover, the parameter function object is central to a lot of other objects in InfiniteOpt. Is is not possible to make is so DP can handle Inf in the one special case that the reference is a parameter function?

I am in favor of adding the queries for finite parameters, but I don't think adding a bound API for parameter functions is the right way to go. It doesn't have much use outside of the niche use case of InfiniteGDPs with Hull. Moreover, the parameter function object is central to a lot of other objects in InfiniteOpt. Is is not possible to make is so DP can handle Inf in the one special case that the reference is a parameter function?

It's possible. I've removed instance of it here.

For parameter functions or perhaps at the GeneralVariableRef level, we can have bound queries that fall back to -Inf and Inf or have the has_xxx_bound functions default to false.