backends/winrt: raise exception when trying to scan with STA #1556
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The pywin32-related packages will implicitly set the threading model to STA when imported. Since Bleak is using WinRT for async methods and we don't have a Windows event loop running, we need to let users know that Bleak is not going to work in this case.
Also add a utility function and troubleshooting docs to provide a workaround for this issue.
Fixes: #1132