[codemod] add codemod for expo/vector-icons

[vonovak]

this adds a codemod that migrates from @expo/vector-icons to the new per-icon-family packages. It transforms the imports, and updates package.json

supported syntax:

named imports:

import { Ionicons, MaterialIcons } from '@expo/vector-icons'

default imports:

import Ionicons from '@expo/vector-icons/Ionicons'

Test plan

Tested locally