(http/mcp) Add options to extract trace context & baggage from mcp params._meta

[antoniovleonti]

Commit Message: (http/mcp) Add options to extract trace context & baggage from mcp params._meta
Additional Description:

add options extract_trace_context and extract_baggage to http mcp filter

Risk Level: low
Testing: unit & integration tested
Docs Changes: none
Release Notes: added

[repokitteh-read-only]

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

🐱

Caused by: #43561 was opened by antoniovleonti.

see: more, trace.

[adisuissa]

Thanks!
High-level question, and comment:

• Will it make sense to add these as part of separate message type? (not an AI, just wondering)
• By reading the API I don't fully understand how these impact a user that configures these config knobs. It would help to think of it from the perspective of an Envoy operator - if they set these flags, what do they expect to see?