[feature request] kruise-rollout helm template add a switch.

[dashapan]

What would you like to be added:
kruise helm template add turn off/on

example:
deployment
apiVersion: apps/v1
kind: Deployment
metadata:
name: workload-demo
namespace: default
spec:
replicas: 10
selector:
matchLabels:
app: demo
template:
metadata:
labels:
app: demo
spec:
containers:
- name: busybox
image: busybox:latest
command: [ "/bin/sh", "-c", "sleep 100d" ]
env:
- name: VERSION
value: "version-1"
rollout helm config

将如下内容存储到文件rollout.yaml。

{{ $grayEnable := .Values.grayEnable | default "" }}
{{ if $grayEnable }}
apiVersion: rollouts.kruise.io/v1beta1
kind: Rollout
metadata:
name: {{ .Values.appname }}
namespace: {{ .Values.namespace}}
spec:
workloadRef:
apiVersion: apps/v1
kind: Deployment
# Deployment Name
name: {{ .Values.appname }}
strategy:
canary:
enableExtraWorkloadForCanary: false
steps:
- replicas: 1
- replicas: 50%
- replicas: 100%
{{end}}

helm upgrade cmd：

helm upgrade -i $Service server -f server/values-$HelmPath/$Service.yaml -n $NameSpace --set image.tag=$DeployTag,grayEnable=True

Why is this needed:
If there is a switch, it would be very convenient.