[BUG] Make auth requests in async context async.

[rescrv]

The auth methods were both sync, which led to latency on the async
thread pool. Fix that.

[github-actions]

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[tazarov]

For posteriority sake. The real issue is not in the thread-pool but rather with the fact that asyc FastAPI executes on the main thread so any synchronous calls inside any of the API funcs will cause the main thread to block processing while the sync call returns, which is the reason we have run_sync calls for most API calls.

That said it might be simpler to just follow the same pattern for the funcs that don't use run_sync with an inner function to wrap the sync auth + api call.

[rescrv]

@tazarov Thank you. A thread of one, that's separate from the other threads is, also, a pool, so I was sloppy in my message.