Upgrade to React Native 0.64.0

[acostalima]

Announcement: https://reactnative.dev/blog/2021/03/12/version-0.64

Useful resources

• Upgrade helper: https://react-native-community.github.io/upgrade-helper/?from=0.61.5&to=0.64.0
• Changelog: https://github.com/react-native-community/releases/blob/master/CHANGELOG.md#v0640
• 0.62.0 discussion: 0.62.0 Discussion react-native-community/releases#179
• Upcoming 0.64.1 discussion: Upcoming v0.64.1 cherrypicks discussion react-native-community/releases#221