Add "--annotation-service" and "--annotation-revision" to kn service create/update

[rhuss]

Feature request

In order to provide the same support as for labels also for annotations, the two options mentioned in the title should be implemented with the same semantics as for labels:

-l, --label stringArray             Labels to set for both Service and Revision. name=value; you may provide this flag any number of times to set
                                      multiple labels. To unset, specify the label name followed by a "-" (e.g., name-).
      --label-revision stringArray    Revision label to set. name=value; you may provide this flag any number of times to set multiple labels. To unset,
                                      specify the label name followed by a "-" (e.g., name-). This flag takes precedence over "label" flag.
      --label-service stringArray     Service label to set. name=value; you may provide this flag any number of times to set multiple labels. To unset,
                                      specify the label name followed by a "-" (e.g., name-). This flag takes precedence over "label" flag.

Use case

One use case is to add sidecar.istio.io/inject: "true" annotation to the pod template which is currently not possible.

cc: @nak3

[navidshaikh]

/assign

[arghya88]

/assign