add __version__

[atravitz]

Describe the bug
A user pointed out that konnektor doesn't have the expected __version__ attribute. we should add this before the next release

To Reproduce
Steps to reproduce the behavior (ideally a minimally reproducible example):

Software versions

• Which operating system and version did you use? (e.g. ubuntu 22.04.5)
• Which method did you use to install this package? (e.g. conda-forge)
• Copy/paste the output of conda list (or the equivalent for your package manager):

Output

Expected behavior

Additional context

[IAlibay]

Thanks for opening this @atravitz

Looks like the __init__ is missing from importlib.metadata import version and __version__ = version('konnektor')