Evaluate yet another review of JuMP Parameters

[jd-lara]

at JuMP dev the new syntax for parameters was shown and exists since JuMP 1.14. We should refactor some of the parameter handling in PSI that could benefit from better syntaxes.

cc. @odow

[odow]

Yeah using @variable(model, p in Parameter(1.0)) and set_parameter_value: https://jump.dev/JuMP.jl/stable/api/JuMP/#JuMP.set_parameter_value

should mean that we automatically add the MOI.EqualTo constraints if you use Gurobi and we automatically use parameters if you use POI or Ipopt.