bug/coroutine-await

Describe the bug
i'm currently using the open source version of unstructured, and getting an exception about coroutine is being awaited already. This causes the parse to fail, and not work.

To Reproduce
It just seems to happen every so often, I'm not sure how to reproduce it. It's not on the same files, if I retry them, they'll succeed. I am putting a lot of files + data through the system, but nothing that seems to be something it shouldnt be able to handle.

Expected behavior
Not get this error.

Screenshots
N/A

Environment Info
I'm pullling downloads.unstructured.io/unstructured-io/unstructured-api:latest as my container and just running this.
Also running unstructured-client = "^0.23.8" on my client side.

Additional context
There's also a few warning that are showing up related to coroutines too:

[2024-08-08 17:10:50,239: WARNING/MainProcess] /home/appuser/.cache/pypoetry/virtualenvs/app-9TtSrW0h-py3.11/lib/python3.11/site-packages/unstructured_client/_hooks/custom/split_pdf_hook.py:202: RuntimeWarning: coroutine 'SplitPdfHook.before_request.<locals>.call_api_partial' was never awaited
  self.coroutines_to_execute[operation_id] = []

[2024-08-08 17:47:48,365: WARNING/MainProcess] Traceback (most recent call last):
[2024-08-08 17:47:48,365: WARNING/MainProcess]   File "<string>", line 1, in <lambda>
[2024-08-08 17:47:48,365: WARNING/MainProcess] KeyError
[2024-08-08 17:47:48,365: WARNING/MainProcess] :
[2024-08-08 17:47:48,365: WARNING/MainProcess] '__import__'
[2024-08-08 17:47:48,366: WARNING/MainProcess] Exception ignored in:
[2024-08-08 17:47:48,366: WARNING/MainProcess] <coroutine object SplitPdfHook.before_request.<locals>.call_api_partial at 0x7f4753372480> 

Start with unstructured_client/_hooks/custom/split_pdf_hook.py around line 202 and review how call_api_partial coroutines are stored and awaited. Reproduce the intermittent failure under the reported high-volume workload, then verify that parsing completes without “coroutine is being awaited already” or “was never awaited” warnings.