Add a lock for ray init to avoid multiple inits

[austintlee]

No description provided.

[austintlee]

This is the error if you try to call ray.init the second time:

error_message = "Perhaps you called ray.init twice by accident?"
>       assert not worker.connected, error_message
E       AssertionError: Perhaps you called ray.init twice by accident?

../../miniconda3/envs/sycamore-ray/lib/python3.12/site-packages/ray/_private/worker.py:2237: AssertionError