Add TS content to rest-api tutorial

[simon-johansson]

trafficstars

I have skipped the testing section for the typescript content as we will not have that when we go live with the public beta.

[encore-cla[bot]]

All committers have signed the CLA.

[github-actions[bot]]

Test Results

  2 files  +    1  227 suites  +43   13m 58s :stopwatch: - 34m 49s 742 tests +  157  739 :white_check_mark: +  164  3 :zzz: +3  0 :x: ±0  742 runs   - 2 064  739 :white_check_mark:  - 2 017  3 :zzz: +3  0 :x: ±0 

Results for commit 31582c88. ± Comparison against base commit ef38225b.

This pull request removes 42 and adds 199 tests. Note that renamed tests count towards both.

encr.dev/e2e-tests ‑ TestRun/encore_currentrequest
encr.dev/e2e-tests ‑ TestRun/et_mocking
encr.dev/e2e-tests ‑ TestRun/et_override_user
encr.dev/e2e-tests ‑ TestRun/et_override_user_authdata
encr.dev/e2e-tests ‑ TestRun/experiment_local_secrets_override
encr.dev/e2e-tests ‑ TestRun/fallback_routes
encr.dev/e2e-tests ‑ TestRun/graceful_shutdown
encr.dev/e2e-tests ‑ TestRun/pubsub_method_handler
encr.dev/e2e-tests ‑ TestRun/pubsub_ref
test/svc ‑ TestEndToEndWithApp
…

encore.dev/appruntime/apisdk/api ‑ TestDescGeneratesTrace
encore.dev/appruntime/apisdk/api ‑ TestDescGeneratesTrace/echo
encore.dev/appruntime/apisdk/api ‑ TestDescGeneratesTrace/invalid
encore.dev/appruntime/apisdk/api ‑ TestDescGeneratesTrace/raw
encore.dev/appruntime/apisdk/api ‑ TestDescGeneratesTrace/unauthenticated
encore.dev/appruntime/apisdk/api ‑ TestDesc_EndToEnd
encore.dev/appruntime/apisdk/api ‑ TestDesc_EndToEnd/echo
encore.dev/appruntime/apisdk/api ‑ TestDesc_EndToEnd/invalid
encore.dev/appruntime/apisdk/api ‑ TestDesc_EndToEnd/unauthenticated
encore.dev/appruntime/apisdk/api ‑ TestRawEndpointOverflow
…

:recycle: This comment has been updated with latest results.

[eandre]

Merged in #1105