Add kuadrant channel & maintainer user group

Author: david-martin

communication/slack-config/channels.yaml

@@ -235,6 +235,7 @@ channels:
   - name: krew
   - name: krex
   - name: krustlet
+  - name: kuadrant
   - name: kube-aws
   - name: kube-bind
   - name: kube-deploy