Ftr:otel trace

[pherzheyu]

What this PR does:
Support ootel trace

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 #1886 (1d4bc71) into 3.0 (b27ec53) will increase coverage by 0.22%.
The diff coverage is 80.00%.

❗ Current head 1d4bc71 differs from pull request most recent head 794059a. Consider uploading reports for the commit 794059a to get more accurate results

@@            Coverage Diff             @@
##              3.0    #1886      +/-   ##
==========================================
+ Coverage   44.82%   45.05%   +0.22%     
==========================================
  Files         283      287       +4     
  Lines       16933    17047     +114     
==========================================
+ Hits         7591     7681      +90     
- Misses       8533     8551      +18     
- Partials      809      815       +6     

Impacted Files	Coverage Δ
filter/otel/trace/filter.go	71.01% <71.01%> (ø)
filter/otel/trace/attachment.go	100.00% <100.00%> (ø)
filter/otel/trace/version.go	100.00% <100.00%> (ø)
common/proxy/proxy_factory/pass_through.go	28.84% <0.00%> (-3.07%)	⬇️
common/proxy/proxy_factory/default.go	20.28% <0.00%> (-1.25%)	⬇️
remoting/getty/listener.go	26.42% <0.00%> (-0.50%)	⬇️
remoting/xds/client.go	52.94% <0.00%> (ø)
common/proxy/proxy_factory/utils.go	0.00% <0.00%> (ø)
cluster/loadbalance/leastactive/loadbalance.go	91.66% <0.00%> (+0.36%)	⬆️
metadata/report/delegate/delegate_report.go	35.09% <0.00%> (+8.60%)	⬆️

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[Lvnszn]

这个为啥用指针，map 应该本来就是个指针吧

[pherzheyu]

map是个引用类型，和指针还是有区别的，当触发map扩容时，引用地址可能会变