Better error message for missing extension

[jofmi]

Is your feature request related to a problem? Please describe. If I try to push a schema to a directus instance without the sync extension, I get the following error:

    errors: [
      {
        "message": "Invalid payload. Collections can't start with \"directus_\".",
        "extensions": {
          "code": "INVALID_PAYLOAD",
          "reason": "Collections can't start with \"directus_\""
        }
      }
    ]
    response: {}

Describe the solution you'd like It would be great if the npx script could detect that the extension is not installed and mention this in the error message.