feat: add pod index label for Advanced StatefulSet

[cr7258]

Ⅰ. Describe what this PR does

Add Pod Index Label for Advanced StatefulSet.

Ⅱ. Does this pull request fix one issue?

fixes #1660

Ⅲ. Describe how to verify it

Deploy an Advanced StatefulSet resource.

apiVersion: apps.kruise.io/v1beta1
kind: StatefulSet
metadata:
  name: sample
spec:
  replicas: 3
  serviceName: fake-service
  selector:
    matchLabels:
      app: sample
  template:
    metadata:
      labels:
        app: sample
    spec:
      containers:
      - name: main
        image: nginx:1.21

The Pod is added an apps.kubernetes.io/pod-index label.

labels:
  apps.kubernetes.io/pod-index: "1"

Ⅳ. Special notes for reviews

[kruise-bot]

Welcome @cr7258! It looks like this is your first PR to openkruise/kruise 🎉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.84%. Comparing base (0d0031a) to head (abdcf23).
Report is 55 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1667      +/-   ##
==========================================
+ Coverage   47.91%   48.84%   +0.92%     
==========================================
  Files         162      188      +26     
  Lines       23491    19273    -4218     
==========================================
- Hits        11256     9414    -1842     
+ Misses      11014     8630    -2384     
- Partials     1221     1229       +8     

Flag	Coverage Δ
unittests	48.84% <100.00%> (+0.92%)	⬆️

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[furykerry]

@cr7258 plz rebase the master and resolve the conflicts

[cr7258]

@furykerry resolved the conflict, please review it again, thanks.

[furykerry]

plz resolve the conflicts by rebasing the master, and plz squash the commits into one

[furykerry]

/lgtm

[ABNER-1]

/lgtm

[kruise-bot]

@ABNER-1: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[furykerry]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: furykerry

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