Multiple Knapsack model

[mandd]

Is your feature request related to a problem? Please describe.
It is needed to develop a Multiple Knapsack model that can be used coupled with RAVEN when
the desired optimization problem requires the use of specific models to generate
knapsack required parameters.

Describe the solution you'd like
Creation of an ad-hoc model which inherits from the ExternalModelPluginBase class

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.