xds ring hash

[binbin0325]

What this PR does:

Which issue(s) this PR fixes:
Fixes #

You should pay attention to items below to ensure your pr passes our ci test
We do not merge pr with ci tests failed

• All ut passed (run 'go test ./...' in project root)
• After go-fmt ed , run 'go fmt project' using goland.
• Golangci-lint passed, run 'sudo golangci-lint run' in project root.
• After import formatted, (using imports-formatter to run 'imports-formatter .' in project root, to format your import blocks, mentioned in CONTRIBUTING.md above)
• Your new-created file needs to have apache license at the top, like other existed file does.
• All integration test passed. You can run integration test locally (with docker env). Clone our dubbo-go-samples project and replace the go.mod to your dubbo-go, and run 'sudo sh start_integration_test.sh' at root of samples project root. (M1 Slice is not Support)

[codecov-commenter]

Codecov Report

Merging #1828 (f22ac49) into 3.0 (7bc593b) will increase coverage by 0.04%.
The diff coverage is 69.56%.

@@            Coverage Diff             @@
##              3.0    #1828      +/-   ##
==========================================
+ Coverage   46.85%   46.90%   +0.04%     
==========================================
  Files         298      300       +2     
  Lines       17163    17293     +130     
==========================================
+ Hits         8042     8111      +69     
- Misses       8275     8321      +46     
- Partials      846      861      +15     

Impacted Files	Coverage Δ
remoting/xds/client.go	52.94% <0.00%> (-3.95%)	⬇️
cluster/loadbalance/ringhash/ringhash.go	63.33% <63.33%> (ø)
cluster/loadbalance/ringhash/ring.go	84.50% <84.50%> (ø)
remoting/xds/ewatcher/ewatcher.go	100.00% <100.00%> (ø)
...tocol/rest/server/server_impl/go_restful_server.go	41.37% <0.00%> (-3.45%)	⬇️
remoting/getty/readwriter.go	39.28% <0.00%> (-3.31%)	⬇️
registry/nacos/listener.go	78.26% <0.00%> (-2.61%)	⬇️
metrics/prometheus/reporter.go	26.85% <0.00%> (-1.72%)	⬇️
protocol/dubbo/impl/codec.go	41.66% <0.00%> (-0.55%)	⬇️
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7bc593b...f22ac49. Read the comment docs.

[AlexStocks]

@sanxun0325 整体我觉得没啥问题，注意下 ut 覆盖率。