Update transpilation to remove import/export syntax from base package

[EvanBacon]

The JS engines that we use with React Native do not support import/export syntax so we essentially offload the changes in this PR to be performed locally on every user's machine. This doesn't fully fix the package since the vendor still has es modules.

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[brentvatne]

my only concern about this is that, unless i'm mistaken, there is a minor breaking change -- if someone was, for some reason, using cjs to import a font directly we won't have default anymore:

// This won't work anymore
const AntDesign = require('@expo/vector-icons/AntDesign').default;

[Simek]

@EvanBacon Do we still need this refactor?