Upgrade to React Native 0.64.x

[nirre7]

Please verify the following:

• yarn ci:test jest tests pass with new tests, if relevant
• README.md has been updated with your changes, if relevant

Describe your PR

Upgrades the boilerplate to React native 0.64.0

• https://reactnative.dev/blog/2021/03/12/version-0.64
• Updated mobx, mobx-react-lite and mobx-state-tree to latest since the Hermes version included in RN064.x should be able to handle proxies.
• There where some regression issue(s) introduced with the 0.64.0 release (Upcoming v0.64.1 cherrypicks discussion react-native-community/releases#221), so expect a minor update when the 0.64.1 releases, or I can update this PR with the next 0.64.x release.
• Also updated other libraries such as react-navigation and react-native-screens afaik there should be no breaking changes.
• Also please be aware of the major dependency changes ⇒ https://reactnative.dev/blog/2021/03/12/version-0.64#major-dependency-version-changes

[nirre7]

Hi @jamonholmgren @bryanstearns

Seems that jest-expo depends on fbjs-scripts which is part of the react-native@^0.63.4 which it uses in assetFileTransformer.js (createCacheKeyFunction), as you can see in the build error.
Seems like react-native@0.64.0 uses another dependency => "@jest/create-cache-key-function" "^26.5.0".
I'm guessing that since expo does not support RN 0.64.x (afaik) this is not an issue for them, yet.

A workaround is to add fbjs-scripts as a temporary dev dependency (it works..) or Ignite needs to wait until expo supports 0.64.x? What do you guys think?

... The app runs though 😅

[jamonholmgren]

Looks amazing. Thanks @nirre7 !

[infinitered-circleci]

🎉 This PR is included in version 6.7.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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