Hello @eshwarbhargav and welcome to the Orekit forum !
The issue you are encountering is a common one. In fact, i answered a post with the same problem today : Adding an AdditionalDerivativesProvider using python
In short, you cannot directly subclass Java interfaces with the wrapper, you need to use their Python equivalent PythonOrekitStepHandler and PythonOrekitFixedStepHandler.
Also, do not remove the super().init() in your subclassing classes. It will not work otherwise.
You will find answers to most wrapper issues here : examples/1_The_Basics.ipynb · master · Orekit Labs / Orekit Python Wrapper · GitLab
Cheers,
Vincent