Added Client Certificate Support for MISP Connector

[Ansah7]

Added Client Certificate Support and removed ExpandedPyMISP with PyMISP to remove deprecation warnings for the class.

Proposed changes

Related issues

Checklist

• [x] I consider the submitted work as finished
• [x] I tested the code for its functionality using different use cases
• [x] I added/update the relevant documentation (either on github or on notion)
• [x] Where necessary I refactored code to improve the overall quality

Further comments