Fix OpenCTIApiClient parameter types

[OBarronCS]

Proposed changes

The OpenCTIApiClient class constructor has some parameters that are internally passed to the Python requests libraries functions. ssl_verify is passed to the verify parameter of request of self.session.get and self.session.post. This PR corrects the type hint for ssl_verify - previously it was bool, however it can also be a str ("path to a CA_BUNDLE file or directory with certificates of trusted CAs"). It also provides type hints for the other untyped parameters.

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case - it's just a type hint, don't know if a test is relevant
• I added/update the relevant documentation (either on github or on notion) - edited the inline doc string
• Where necessary I refactored code to improve the overall quality