Fix the diode tests + Refactor with @mtkmodel
          #373
        
          
      
                
     Merged
            
            
          
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Rodas4 is set as the solver.


O/p for DiodeTest:
O/p for DiodeTest in Modelica:
O/p for Heating diode:

Checklist
contributor guidelines, in particular the SciML Style Guide and
COLPRAC.
Existing issue:
Automatically picked solver doesn't capture the true dynamics of the test circuits. That resulted foll. o/p:
