PlatformCompatibilityAnalyzer should report a warning for UnsupportedOSPlatform attribute in interface implementation

[Youssef1313]

Analyzer

Diagnostic ID: CA1416: Validate platform compatibility

Describe the bug

If an implementation of an interface member has UnsupportedOSPlatform, while the interface member itself doesn't, this should be a warning. For example:

public interface IMyInterface
{
    public string MyProperty { get; }
}

public class MyImpl : IMyInterface
{
    [UnsupportedOSPlatform("browser")]
    public string MyProperty
    {
        get
        {
            // ...
        }
    }
}

Because, MyProperty can still be accessed via the interface without a warning, masking an issue.

[Evangelink]

It's possible that different implementations have different constraints so we may have different expectations but it might still be a good option for users.