Add Linking examples in rn-tester (#30547)

Summary:
Added examples to RNTester for the Linking API.

## Changelog
[General] [Added] - Added example for openSettings() for Linking API.
[General] [Added] - Added [LSApplicationQueriesSchemes](https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/LaunchServicesKeys.html#//apple_ref/doc/uid/TP40009250-SW14) in info.plist with entries tel, telprompt, http, fb, geo

Pull Request resolved: https://github.com/facebook/react-native/pull/30547

Test Plan: ![Screen Recording 2020-12-07 at 11 19 13 PM (1)](https://user-images.githubusercontent.com/16796008/102250807-05001580-3f2a-11eb-9ce0-58de4d6fca54.gif)

Reviewed By: yungsters

Differential Revision: D30559457

Pulled By: lunaleaps

fbshipit-source-id: dba2721a9905ddb9ddd2b14141e5553bdf8880da