Add example of uploading a video to Cloudflare Stream using tus-js-client

[irvinebroque]

merge after https://github.com/cloudflare/templates/pull/98

[JacobMGEvans]

Hey Brendan, if you are willing to move this to the new Templates location in the workers-sdk monorepo we can reevaluate adding it there 😄 https://github.com/cloudflare/workers-sdk/tree/main/templates