[PATCH v14 0/8] MR6892: propsys: Implement IPropertyDescription for several known system properties.

[Vibhav Pant (＠vibhavp)]

This MR adds a very basic implementation of `IPropertyDescription` for system defined properties (i.e, the ones in \<propkey.h\>). This is needed to support the [`Properties`](https://learn.microsoft.com/en-us/uwp/api/windows.devices.enumeration.device...) method for `IDeviceInformation` in Windows.Devices.Enumeration (!6874).

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  v14: propsys: Implement IPropertyDescription for several known system properties.
       propsys: Add IPropertyDescription stub for system defined properties.
       propsys/tests: Add conformance tests for PSGetNameFromPropertyKey.
       propsys: Add stubs for PSGetNameFromPropertyKey.
       propsys: Add stubs for PropertySystem.
       include: Add declaration for PSGetPropertySystem.
       propsys/tests: Add conformance tests for PSGetPropertyKeyFromName.
       propsys/tests: Add conformance tests for getting PropertyDescriptions from PropertySystem.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/6892