[Proposal] use CRD to quickly enable more features

[zxh326]

Objective:

let users to quickly create a resource to use some features, such as warming up data, creating cache group clusters.

Example:

• Warrmup

ref: #872

In a certain scenario, users need to pre-warm one or more data.

The following resources can be created:

apiVersion: csi.juicefs.com/v1
kind: Warmup
metadata:
  name: app-warmup
  namespace: default
spec:
  pv: xxxx
  concurrent: 50
  cachegroup: xx

Then we will create a task to execute this plan.

• Create cache group clusters.
  TBD

• Sync
  TBD

• Schedule some jobs
  TBD