Add typescript-eslint

[marcofugaro]

• https://eslint.org/docs/user-guide/migrating-to-6.0.0
• https://github.com/facebook/create-react-app/pull/7230/files
• Indentation rule conflict with prettier typescript-eslint/typescript-eslint#372
• https://github.com/facebook/create-react-app/pull/8003/files