fix: make package namespace compliant

[Michael Matzka (mima0815)]

Description

Removes unnecessary __init__.py files, which solves a namespacing issue with other packages which are using the same root namespace (fds.sdk.*)

Checklist

Ensure the following things have been met before requesting a review:

• Follows all project developer guide and coding standards.
• Tests have been written for the change, when applicable.
• Confidential information (credentials, auth tokens, etc...) is not included.