[DX idea] offer to install aws-amplify and approprite UI component library after `amplify init`

**Is your feature request related to a problem? Please describe.**

people often forget to install `aws-amplify` and `@aws-amplify/ui-react` after `amplify init`

**Describe the solution you'd like**

check package.json, and if the libraries are not there, offer to install them?

**Describe alternatives you've considered**
do nothing