add lua scripts for istio

[Kuromesi]

Ⅰ. Describe what this PR does

Add lua scripts for istio.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Special notes for reviews

[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

Codecov Report

Merging #178 (ef561d8) into master (57f9853) will decrease coverage by 0.88%.
Report is 3 commits behind head on master.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master     #178      +/-   ##
==========================================
- Coverage   44.44%   43.56%   -0.88%     
==========================================
  Files          51       52       +1     
  Lines        5560     5672     +112     
==========================================
  Hits         2471     2471              
- Misses       2666     2778     +112     
  Partials      423      423              

Flag	Coverage Δ
unittests	43.56% <ø> (-0.88%)	⬇️

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

Files	Coverage Δ
pkg/controller/rollout/rollout_controller.go	10.95% <ø> (ø)

... and 11 files with indirect coverage changes

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[zmberg]

/lgtm

[zmberg]

/approve