Public the Menu Parameters set API

[lindexi]

Fixes #5944 #4641

Description

We can ignore the System settings by the code:

        SystemParameters.StaticPropertyChanged += (sender, eventArgs) =>
        {
            SystemParameters.MenuDropAlignment = false;
        };

cc @miloush

Customer Impact

Regression

Testing

CI and My demo

Risk

Low.

Microsoft Reviewers: Open in CodeFlow

[miloush]

Wouldn't be possible for the setters to actually set the system parameters? How do users cancel the override? Could we rather not fix the consumers to use MenuDropAlignmentKey as a dynamic resource and override it in app resources?