Add TypeScript to Hotwired/Turbo

To give additional context, turbo just removed TypeScript. Here is the rationale https://world.hey.com/dhh/turbo-8-is-dropping-typescript-701...

This is the PR to remove it https://github.com/hotwired/turbo/pull/971

This is the PR to merge it back (backlash?) https://github.com/hotwired/turbo/pull/972

EDIT: https://news.ycombinator.com/item?id=37409348

is it mockery to dhh last posts right?