New alert screen

[anku255]

Summary

Fixes #15

Changelog

• Added new use case for the Alert API as mentioned in Implement the new Alert Screen #15
• Wrote each use case in a separate example block to allow searching
• Wrote Detox tests for the Alert Screen

Test Plan

• Run the RNTester app locally by following these instructions.
• Search for Alerts and tap on it

[chirag-singhal]

@anku255 these tests most probably will fail with current navigation. Also i tried running some of the tests on migrated RNTester with the new UI, they are acting weird.

[anku255]

@chirag-singhal yes! you are right. This will fail because of the new navigation. I will update them after the design review.

Also i tried running some of the tests on migrated RNTester with the new UI, they are acting weird.

You mean you ran them on the packages/RNTester? What do you mean by acting weird?

[chirag-singhal]

@anku255 yes i ran them on packages/RNTester. I guessed atleast component tests should pass, but Modal tests suddenly goes to bookamark screen and then fails. Button tests doesn't tap on button.