TypeScript / react: don't use default import for React in the .d.ts files

[elnygren]

// not like this
import React from 'react'

// but like this
import * as React from 'react'
import { Something } from 'react'

if you do import React from 'react' then @shopify/app-bridge-react becomes unusable for people who set allowSyntheticDefaultImports false.