[Feature]: Merge the utilities.py script into the base_model.py for simulation methods or to a second base class only for gLV or gMLV methods

[Fontanapink]

Feature Title

merge utilities.py into either sim_gLV.py, sim_gMLV.py or base_simulate.py

Is your feature request related to a problem?

So there is a utilities.py script under the utilities directory that is used to compare parameters and plot diagrams for all the sim_gLV and sim_gMLV classes. This is not in accordance with the rest of the package's structure. We have to merge these methods into either sim_gLV.py, sim_gMLV.py or base_simulate.py

Describe the solution you'd like

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Additional Context

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• good first issue
• help wanted
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