Add apps page to the frontend

[petethepig]

We need a page that would list all apps and have delete buttons. It should go under Settings. The route should be /settings/apps.

For now we should just make it a table with all the apps and one button (delete). We should make it look similar to other similar pages, e.g /settings/users. I know @dogfrogfog is working on a unified table component, it's a good idea to use that one here.

Regarding the backend. We have 2 API endpoints, one for listing apps:

GET /api/apps

One for deleting apps, it requires a DELETE method and takes a JSON with one field (name):

DELETE /api/apps
{
  "name": "pyroscope.server.cpu"
}

These routes are authentication protected, so to use them, run pyroscope with the following arguments:

PYROSCOPE_AUTH_INTERNAL_ENABLED=true make dev

You can then log into pyroscope using admin/admin combination.

[eh-am]

Let's not forget to add a warning/confirmation when deleting apps. Similar to
https://github.com/pyroscope-io/pyroscope/blob/main/pkg/admin/cli.go#L62-L75

[Rperry2174]

completed in #1424