Moving python client to its own repo

[ridv]

As mentioned on the Aurora slack channel a few days ago, I'm currently ill equipped in terms of bandwidth and knowledge to maintain the Aurora python client.

Coupled with the fact that Python 2 will no longer be seeing security updates, I feel it's the right time to move the python client to its own repository. Hopefully, this opens up the opportunity for someone else to take over maintenance on their own schedule and bring it to Python 3.

I will do my best to simultaneously contribute new features and or changes necessary to allow the aurora python client to maintain compatibility with the later versions of the scheduler.

[ridv]

Done in #10