Add PostCreated Lifecycle Hook

[veophi]

Signed-off-by: mingzhou.swx [email protected]

Ⅰ. Describe what this PR does

PostCreated lifecycle hook allow users do something before Pod become available, e.g., check whether the Pod IP has been added to SLB.

Now, the Pod lifecycle is:

[codecov-commenter]

Codecov Report

Merging #1071 (13969d5) into master (a639a6f) will increase coverage by 0.12%. The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master    #1071      +/-   ##
==========================================
+ Coverage   49.30%   49.43%   +0.12%     
==========================================
  Files         137      137              
  Lines       19299    19305       +6     
==========================================
+ Hits         9515     9543      +28     
+ Misses       8732     8712      -20     
+ Partials     1052     1050       -2     

Flag	Coverage Δ
unittests	49.43% <81.81%> (+0.12%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/controller/cloneset/sync/cloneset_scale.go	28.25% <33.33%> (ø)
pkg/controller/cloneset/sync/cloneset_update.go	59.92% <100.00%> (+8.75%)	:arrow_up:
pkg/util/podreadiness/pod_readiness_utils.go	74.33% <100.00%> (ø)
pkg/controller/uniteddeployment/revision.go	67.02% <0.00%> (+1.06%)	:arrow_up:

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[zmberg]

/lgtm

[zmberg]

/approve

[furykerry]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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