Datasette-events-forward

- Silently ignore events if `api_url` has not been configured, rather than accumulating them in the `datasette_events_to_forward` table. [2](https://github.com/datasette/datasette-events-forward/issues/2)
- Events are now deleted from `datasette_events_to_forward` as soon as they have been delivired. [3](https://github.com/datasette/datasette-events-forward/issues/3)

- Initial implementation. Forwards tracked events to another Datasette instance via the JSON Write API. [1](https://github.com/datasette/datasette-events-forward/issues/1)