[standards] Rewrite imports in RNTester to use standard paths

[ide]

Summary

See #24316 for the motivation. This commit rewrites the imports in the RNTester project.

Changelog

[General] [Changed] - Replaced Haste-style imports with standard path-style imports for RNTester

Test Plan

Run RNTester and verify that it loads without any issues. Tap through each screen to ensure the JS modules load (that is, were bundled) correctly.

[analysis-bot]

Code analysis results:

• flow found some issues.

[cpojer]

Instead of the relative paths, what do you think about doing require('react-native/Libraries/…')?

[analysis-bot]

Code analysis results:

• eslint found some issues. Run yarn lint --fix to automatically fix problems.

[ide]

• Updated requires to use the public interface where possible (const {View} = require('react-native'))
• Changed const ReactNative = require('react-native'); const {...} = ReactNative; to const {...} = require('react-native');, which sets us up to move to import/export more easily
• I left requires of internal modules (utilities, for example) alone, since React Native may want to seal them off entirely outside of the Facebook repo and not encourage require('react-native/Libraries/Utilities/...'). React in particular publishes itself pre-bundled to intentionally separate its public interface from its internals and prevent require('react/...').

[cpojer]

Nice work. Thank you for doing this.

[facebook-github-bot]

@cpojer is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @ide in 26cce3d.

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