MeshService toggle in policy_yaml

[slonka]

Description

On the last meeting with @lahabana we discussed changes to docs with relation to the changes to MeshService.

We would like to introduce a checkbox that would convert from "old style" MeshServcie:

  targetRef:
    kind: MeshService
    name: web_kuma-demo_svc_8080

To new style:

  targetRef:
    kind: MeshService
    namespace: kuma-demo
    name: web
    sectionName: http

It could look something like this:

We'd like the checkbox value to be persisted for each session.

We can supply the code to convert between the two. One thing that would be problematic is sectionName right?

This idea came from trying to figure out this issue: #1892.

[slonka]

triage: have the code be written in the new way and the plugin will convert this dynamically