Apps: Add Example App to ./apps (#112069)

* [API Server] Add Example App for reference use.

* Remove Printlns.

* Upgrade app-sdk to v0.46.0, update apps to handle breaking changes.

* Only start the reconciler for the example app if the v1alpha1 API version is enabled.

* Some comment doc updates.

* Run make update-workspace

* Set codeowner for /apps/example

* Run make gofmt and make update-workspace

* Run prettier on apps/example/README.md

* Add COPY apps/example to Dockerfile

* Add an authorizer to the example app.

* Fix import ordering.

* Update apps/example/kinds/manifest.cue

Co-authored-by: Owen Diehl <ow.diehl@gmail.com>

* Run make update-workspace

* Re-run make gen-go for enterprise import updates

* Run make update-workspace

---------

Co-authored-by: Owen Diehl <ow.diehl@gmail.com>

.github/CODEOWNERS

@@ -96,6 +96,7 @@
 /apps/iam/ @grafana/access-squad
 /apps/sdk.mk @grafana/grafana-app-platform-squad
 /apps/correlations @grafana/datapro
+/apps/example/ @grafana/grafana-app-platform-squad
 /apps/logsdrilldown/ @grafana/observability-logs
 /pkg/api/ @grafana/grafana-backend-group
 /pkg/apis/ @grafana/grafana-app-platform-squad