support custom network provider

[zmberg]

Ⅰ. Describe what this PR does

Based on lua script, it supports custom crd network provider, for examples: Istio VirtualService, Apisix ApisixRoute

[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov-commenter]

Codecov Report

Merging #111 (78f26c8) into master (3165f4e) will increase coverage by 0.38%.
The diff coverage is 60.57%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   45.63%   46.01%   +0.38%     
==========================================
  Files          39       40       +1     
  Lines        3938     4042     +104     
==========================================
+ Hits         1797     1860      +63     
- Misses       1843     1869      +26     
- Partials      298      313      +15     

Flag	Coverage Δ
unittests	46.01% <60.57%> (+0.38%)	⬆️

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Impacted Files	Coverage Δ
pkg/trafficrouting/manager.go	50.81% <0.00%> (-2.33%)	⬇️
pkg/trafficrouting/network/custom/custom.go	65.62% <65.62%> (ø)

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[sonatype-lift]

💬 2 similar findings have been found in this PR

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goimports: File is not goimports-ed

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File Path	Line Number
pkg/trafficrouting/network/custom/custom_test.go	22
pkg/trafficrouting/manager.go	22

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[kruise-bot]

@zmberg: PR needs rebase.

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