tracing: general tracing support#16049

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wbpcode wants to merge 17 commits intoenvoyproxy:mainfrom

wbpcode:general-tracing

Commits on Apr 19, 2021

first commit
wbpcode
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fix format
wbpcode
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fix proto format
wbpcode
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fix http connection manager test
wbpcode
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Commits on Apr 20, 2021

clang-tidy
wbpcode
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Commits on Apr 21, 2021

add more test
wbpcode
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Merge branch 'main' of https://github.com/envoyproxy/envoy into general-tracing
wbpcode
committed

Commits on Apr 26, 2021

fix some name etc.
wbpcode
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rename TracingContext to TraceContext
wbpcode
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Merge branch 'main' of https://github.com/envoyproxy/envoy into general-tracing
wbpcode
committed

Commits on Apr 27, 2021

remove used api and update trace context interface
wbpcode
committed

Commits on Apr 28, 2021

Merge branch 'main' of https://github.com/envoyproxy/envoy into general-tracing
wbpcode
committed

Commits on Apr 29, 2021

Merge branch 'main' of https://github.com/envoyproxy/envoy into general-tracing
wbpcode
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move lower case string to common and add new interface to trace context for case-insensitive key
wbpcode
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update context key
wbpcode
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fix format
wbpcode
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make lower case string validator pluggable
wbpcode
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