feat: improve polaris register and discovery

[houseme]

#2726

[codecov-commenter]

Codecov Report

Patch coverage: 77.77% and project coverage change: +0.25 🎉

Comparison is base (740dfa5) 78.85% compared to head (8f4f0f5) 79.11%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2739      +/-   ##
==========================================
+ Coverage   78.85%   79.11%   +0.25%     
==========================================
  Files         633      633              
  Lines       51970    52020      +50     
==========================================
+ Hits        40980    41154     +174     
+ Misses       8961     8832     -129     
- Partials     2029     2034       +5     

Flag	Coverage Δ
go-1.15-386	79.15% <77.77%> (+0.27%)	⬆️
go-1.15-amd64	79.14% <77.77%> (+0.26%)	⬆️
go-1.16-386	79.15% <77.77%> (+0.27%)	⬆️
go-1.16-amd64	79.15% <77.77%> (+0.27%)	⬆️
go-1.17-386	79.13% <77.77%> (+0.26%)	⬆️
go-1.17-amd64	79.13% <77.77%> (+0.25%)	⬆️
go-1.18-386	78.74% <77.77%> (+0.28%)	⬆️
go-1.18-amd64	78.73% <77.77%> (+0.26%)	⬆️
go-1.19-386	79.13% <77.77%> (+0.29%)	⬆️
go-1.19-amd64	79.13% <77.77%> (+0.26%)	⬆️
go-1.20-386	79.13% <77.77%> (+0.25%)	⬆️
go-1.20-amd64	79.13% <77.77%> (+0.31%)	⬆️

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Impacted Files	Coverage Δ
contrib/registry/polaris/polaris_watcher.go	62.29% <0.00%> (+5.15%)	⬆️
net/gsvc/gsvc.go	66.66% <ø> (ø)
contrib/registry/polaris/polaris.go	60.00% <100.00%> (ø)
contrib/registry/polaris/polaris_discovery.go	78.72% <100.00%> (+8.95%)	⬆️
net/gsvc/gsvc_endpoints.go	100.00% <100.00%> (ø)

... and 14 files with indirect coverage changes

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[gqcn]

@houseme 针对修改的内容，没有完善polaris的单测？

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

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@houseme For the modified content, there is no single test for polaris?

[houseme]

@gqcn 添加了一个测试，以及新增了example

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

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@gqcn added a test and added an example