feat: add opt-out for prestet-flow to work with @babel/preset-typescript

Created by: oieduardorabelo

related to #3863 (closed),

now you can make babel-preset-react-app@next work nicely with @babel/preset-typescript:

{
  "presets": [
    ["react-app", {
        "flow": false 
    }],
    "@babel/typescript"
  ]
}