Add support for logical assignment operators to metro-react-native-babel-preset

[frenic]

This PR adds support for expr1 ??= expr2, expr1 ||= expr2 and expr1 &&= expr2. These are perfectly fine to use with Typescript but it ends up with Unexpected token: operator (?) error with the ??= operator when running with metro-transform-worker.

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[izakfilmalter]

Any word on getting this merged?

[motiz88]

Can confirm this is still needed on Android JSC (at least as of Expo SDK 47 / React Native 0.70).