dotnet / dotnet/aspnetcore

[Analyzer] Detect AllowSynchronousIO

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analyzer area-networking
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Description

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

AllowSynchronousIO = true has a big impact on performance. The documentation on the property has warnings, but not everyone reads API docs.

### Describe the solution you'd like

Analyzer checks for `AllowSynchronousIO = true` (can also warn when set via method or variable) and warns about the performance impact of this setting.

### Additional context

_No response_

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