mcp_filter: add mcp methods group annotations

[botengyao]

#39174

This allows a group policy enforcement rather than apply on each method.

Added method group classification to the MCP filter. Methods are classified into built-in groups (lifecycle, tool,
resource, prompt, notification, logging, sampling, completion, unknown) and the group is added to dynamic metadata

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[repokitteh-read-only]

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🐱

Caused by: #42877 was opened by botengyao.

see: more, trace.

[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 @wbpcode
CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

🐱

Caused by: #42877 was opened by botengyao.

see: more, trace.

[wbpcode]

/lgtm api