feat: add support for tracing tags

[zirain]

xref: #7795

[zirain]

wait #7540

[codecov]

Codecov Report

❌ Patch coverage is 61.11111% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.82%. Comparing base (b28b77c) to head (d42942f).

Files with missing lines	Patch %	Lines
internal/xds/translator/tracing.go	56.25%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7828      +/-   ##
==========================================
- Coverage   72.87%   72.82%   -0.05%     
==========================================
  Files         237      237              
  Lines       35509    35517       +8     
==========================================
- Hits        25877    25867      -10     
- Misses       7792     7808      +16     
- Partials     1840     1842       +2     

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✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

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[arkodg]

LGTM thanks

[zhaohuabing]

Question: Could tags and customTags conflict with each other? Should we de-duplicate them?

[zirain]

it could, and we mentioned in the API that tags take precedence.