tcp tunneling: optionally move response header to downstream info

[kyessenov]

trafficstars

Signed-off-by: Kuat Yessenov [email protected]

Commit Message: Add support to save response headers from CONNECT tunnels in tcp_proxy. Fixes #23116 Additional Description: The use case is saving "baggage" header which provides additional metadata about the upstream endpoint for telemetry purposes. Risk Level: low (opt-in) Testing: unit, integration Docs Changes: none Release Notes: yes

[repokitteh-read-only[bot]]

CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy/|docs/root/api-docs/). envoyproxy/api-shepherds assignee is @markdroth CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/23118 was opened by kyessenov.

see: more, trace.

[markdroth]

/lgtm api

[markdroth]

/lgtm api