feat: Add Proximity sample

[muhmuhhum]

GitHub Issue (If applicable): closes #1026

PR Type

What kind of change does this PR introduce?

• Feature Sample Page for Proximity Sensor

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested on iOS.
• Tested on Wasm.
• Tested on Android.
• Tested on UWP.
• Tested in both Light and Dark themes.
• Associated with an issue (GitHub or internal)

Other information

Internal Issue (If applicable):

[CLAassistant]

All committers have signed the CLA.

[muhmuhhum]

ok so this is a WIP cause i cant test it on my android emulator.
The app just wont start and i cant really find out why.
So i currently start the app in debug with any cpu and the mobile project.
I also changed IsUiAutomationEnabled in the csproj to false
@morning4coffe-dev maybe you could help me out with this.

[morning4coffe-dev]

@muhmuhhum Thanks! Can you please check if it works on Windows (you can add || !HAS_UNO next to the __ANDROID__)? And also sync your branch with current master?

[muhmuhhum]

@morning4coffe-dev Windows is now tested, added the !HAS_UNO and merged the current master