chore(starters): add gatsby-starter-typescript (#21245)
chore(starters): add gatsby-starter-typescript (#21245)

* chore(starters): add gatsby-starter-typescript

* Fix linter errors

Co-authored-by: LB <8468275f0d120527324004754c3d088324306866@gatsbyjs.com>

gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby