feat: add support for custom tags in tracing configuration #3099
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yangyy93
requested review from
CH3CHO,
SpecialYang and
johnlanni
as code owners
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Ⅰ. Describe what this PR did
在配置链路时新增自定义标签的选项，有以下逻辑：
当链路追踪开启时生效，默认为空
支持添加多个自定义标签，每个自定义标签的key不能为空且不能重复。
自定义标签的值分为固定值，从环境变量获取，从请求头中获取，而且值的获取方式只能选择其中一个。从环境变量获取和请求头中获取时可以设置默认值。值不允许为空。
Ⅱ. Does this pull request fix one issue?
fixes #3098
Ⅲ. Why don't you add test cases (unit test/integration test)?
Ⅳ. Describe how to verify it
Ⅴ. Special notes for reviews