Add `openai` whl

[deathaxe]

The package requires - besides others - httpx which itself comes with a dozen of dependencies.

https://github.com/openai/openai-python/blob/50371bf3151ebb1a43017abfe205d4d9b2e5faac/pyproject.toml#L10-L19

To support this package all dependencies would explicitly need to be added as well to this channel and referenced in a dependencies.json.

Not sure we really want that.