Add Fabric Interop constants example

[cipolleschi]

Summary: This changes adds an example to RNTester to verify that the Interop Layer can process constants in Fabric as it used to do in Paper.

Changelog:

[iOS][Added] - Add example in the Interop Layer to use constants

Reviewed By: cortinico

Differential Revision: D43911916

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D43911916

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,516,921	+976
android	hermes	armeabi-v7a	7,832,583	+868
android	hermes	x86	8,997,353	+1,207
android	hermes	x86_64	8,852,549	+985
android	jsc	arm64-v8a	9,140,991	+310
android	jsc	armeabi-v7a	8,332,489	+314
android	jsc	x86	9,195,843	+320
android	jsc	x86_64	9,453,891	+314

Base commit: e26092aec34ed3ff3f4b9598b36486f7c584510e Branch: main

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D43911916

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D43911916

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D43911916

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D43911916

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D43911916

[facebook-github-bot]

This pull request has been merged in facebook/react-native@a5866ca3aad53802e8010295a205e956e8e26120.