Create a shadow service for the TrafficSplit root service if service does not exist

[kevinpollet]

Feature Request

Proposal

Currently, Traefik Mesh does not create a shadow service for the TrafficSplit root service if it does not exist. As described in the SMI specification, if the root service of a TrafficSplit does not exist it should be created by the SMI implementation.

To enhance the user experience a shadow service corresponding to the TrafficSplit root service should be created automatically even if the root service does not exist.