feat(react-native): Add support for Expo managed projects

[krystofwoldrich]

• closes Add Sentry Metro Plugin for Expo  #498

This PR adds support for Expo project (with and without native dirs).
The support includes:

• patch app.json configuration file with @sentry/react-native/expo
• create or patch metro.config.json with @sentry/react-native/metro getSentryExpoConfig
• patch Expo Xcode Build Phase with sentry-xcode.sh
• add .env.local with Sentry Auth Token
• gitignore .env.local

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against d4513bf

[krystofwoldrich]

@lucas-zimerman you can also take a look. 🙏

[lucas-zimerman]

Looks good to me!
After the release of the new wizard, we should update the docs here https://docs.sentry.io/platforms/react-native/ on how to setup an expo project.

[krystofwoldrich]

Yes, related docs PR here.

• Add Expo manual setup steps sentry-docs#8631

[krystofwoldrich]

DO NOT MERGE!

The current implementation overwrites Expo default customSerializer. The build of an app still works, but the wizard unexpectedly removes some processing of the bundle.

Add check for app.json before app.config.json.

[Lms24]

@krystofwoldrich is this ready for a review? (no rush, just trying to catch up with wizard stuff after PTO 😅)

[krystofwoldrich]

@Lms24 Thank you for the message, yes, since the morning it's ready for review.

[Lms24]

LGTM from general wizard perspective! I couldn't test it though as I don't have an RN test environment, so deferring this to other reviewers/you :)

All good to merge from my end!