Traefik package in the init package

[Racer159]

Is your feature request related to a problem? Please describe.
Currently we use --disable-traefik on our k3s server run leaving it up to customers to bring their own ingress. This is fine on more complex deploys but it would be nice to have an easy default for those who don't need the complexity.

Describe the solution you'd like
A new (optional) init package that installs the Traefik chart into a cluster to setup ingress.

Describe alternatives you've considered
We could make the --disable-traefik flag configurable more directly but this could open things up to more complexity with our configuration.

Additional context
This will be useful in making the init package more a-la-carte (see #1062)

[Racer159]

closing since we support --set K3S_ARGS="" now