fix: lua encode structural error

[ls-2018]

Ⅰ. Describe what this PR does

Pass an object to lua for modification, and the resulting return value. After serialization the field type changed.  

if not fix, the jsonBytes whill be 

 {"metadata":[],"spec":{"containers":[{"image":"centos:7","name":"centos","resources":[]}]},"status":[]}

• metadata
• status
• resources

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 43.83%. Comparing base (07c1731) to head (f794fe8). Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
+ Coverage   43.63%   43.83%   +0.19%     
==========================================
  Files          52       52              
  Lines        5681     5681              
==========================================
+ Hits         2479     2490      +11     
+ Misses       2778     2765      -13     
- Partials      424      426       +2     

Flag	Coverage Δ
unittests	43.83% <100.00%> (+0.19%)	:arrow_up:

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[zmberg]

/lgtm

[furykerry]

/lgtm /approve