API: Fix blocking iterator execution

Run these iterators on the background thread. On startup, the API
spawns a background thread as needed to run sync code on without blocking
the event loop.

Use asyncio's run_thread function since it allows for errors to be
propegated.

Signed-off-by: kingbri <bdashore3@proton.me>

common/model.py

@@ -72,7 +72,7 @@ async def load_model_gen(model_path: pathlib.Path, **kwargs):
 
 
 async def load_model(model_path: pathlib.Path, **kwargs):
-    async for _, _, _ in load_model_gen(model_path, **kwargs):
+    async for _ in load_model_gen(model_path, **kwargs):
         pass