Support TLS for IngressRoute

When Dask Gateway is hosted in a secure corporate environment (that prohibits accessing the dashboard via http), we still want to provide that ability to the users.
At the minimum, be able to support the follow generated route:
```yaml
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
....
spec:
entryPoints:
- websecure
tls:
options:
domains:
- main: eyal-dask-cpu.812896951795.dev.aws.jpmchase.net
routes:
- kind: Rule
...
```