feat(react-native): sample app & voice transcription

[isekovanic]

This PR looks larger than it actually is because of the introduction of the RN sample app in the repo. Realistically, it's whatever the app's App.tsx file contains and then everything within packages/react-native-sdk.

Everything else does not need to be reviewed and was generated with create-react-native-app (with slight modifications for known issues as well as library installations).

In addition, it also includes:

• Clipboard support for code blocks
• A rudimentary state layer for bottom sheet, dictation and the text input
• Refactoring of the services API a bit so that it's easier to consume

TODO:

• iOS voice dictation
• Clean useDictation up a bit

[changeset-bot]

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