Streamline naming in python library

[bossenti]

Body

Currently, we mix up different naming styles in the Python client. Some variables and methods are named in camelCase and others in snake_case. We should follow one here to provide a consistent API.

StreamPipes Committer

I acknowledge that I am a maintainer/committer of the Apache StreamPipes project.

[bossenti]

@SvenO3 and I would argue for snake_case but I could also imagine some benefits if we agree on one naming style across StreamPipes What are your thoughts here @dominikriemer @tenthe?

[dominikriemer]

+1 for snake_case in the Python client as I'd assume this is what Pythond developers expect.