Add RNTester examples for `display: contents` (#47201)

Summary:
Adds a page dedicated to `display: contents` to RNTester APIs section. Those can be used to verify that it's working correctly visually.

Needs https://github.com/facebook/react-native/pull/47194

## Changelog:

[INTERNAL] [ADDED] - Added `display: contents` examples to RNTester

Pull Request resolved: https://github.com/facebook/react-native/pull/47201

Test Plan:
Row styles are ignored in new arch and TextInputs as leaf are hidden

https://www.internalfb.com/compare-screenshots-from-diff/D65248256

Reviewed By: javache

Differential Revision: D65248256

Pulled By: NickGerleman

fbshipit-source-id: 90410e1380e4cdb22cb4cac5c8c21e08a088ce69