add new CLI feature for selecting target device

[esthor]

What: There is a new --list-devices flag being added to the React Native CLI that provides an interactive list of available devices (for both iOS and Android). It's very nice.

Why: TL;DR: Convenience & ✨✨ Developer Experience ✨✨

This interactive approach allows a user to not need to manually run xcrun simctl list devices or adb devices in order to copy and then paste the exact device name into a --simulator <simulator_name> or --deviceID <device_id> , for iOS and Android, respectively.

Status: Besides approval on this PR, these changes need to land over in React Native CLI land:

• [x] Android is already merged -- https://github.com/react-native-community/cli/pull/1765 (🥇 @adamTrz )
• [x] iOS is merged https://github.com/react-native-community/cli/pull/1676
• [ ] Lands in a release

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Not In Scope

Consolidating the docs around running on devices and simulators/emulators. I noticed that there are at least 3 few places mentioning how to run (Environment Setup, Running on Device, Running on iOS Simulator), but it doesn't feel like there is a definitive place or pattern to the docs. For instance, that third location is a specific iOS guide for running on specific devices/simulators, but there isn't a similar page in the Android guide on the same topic.

Suggestion:

1. Make an Android "Running on Emulator" (mirroring the iOS "Running on Simulator")
2. Expand these to fully cover running on physical devices, as well. They should become the definitive guides on building to specific iOS and Android dev targets, respectively.
3. Remove explanations in Environment Setup and Running on Device pages, and replace them with a reference to these 2 new "definitive" pages.
4. Drastically simplify the "Running on Device" page to use the automated processes the CLI supports. E.g., for Android, the CLI will try to do the adb reverse for selected device, it will also interactively list devices, etc. You could turn this page for Android dev into "Run npx react-native run-android --list-devices and select the connected device or emulator you'd prefer. For more information, check the <Running on Android> Page", which would also have the (old) manual steps.

I may also be hyper-focused on this topic and it's maybe not that big of a deal. 🤷

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