RN-252: Add Expo Sample App

[stanwolverine]

Description

feat(example-app): :sparkles: Added Expo & Prebuilt sample app

Pre-launch Checklist

• [x] The Documentation is updated accordingly, or this PR doesn't require it.
• [x] I have updated the ExampleAppChangelog.txt file with relevant changes.
• [x] I updated/added relevant documentation (doc comments with ///).
• [x] I listed at least one issue that this PR fixes in the description above.
• [x] I added new tests to check the change I am making, or this PR is test-exempt.
• [x] All existing and new tests are passing.

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