feat(autogen-core): add gen_ai.agent.action_ref to trace_tool_span for cross-producer audit correlation

[Hardik-369]

Adds an optional �ction_ref parameter and a derive_action_ref() helper to race_tool_span().

Changes:

• New constant GEN_AI_AGENT_ACTION_REF = "gen_ai.agent.action_ref"
• New derive_action_ref() function producing a deterministic SHA-256 hex digest from canonical JSON of agent_id, action_type, scope, and timestamp_ms
• Optional �ction_ref parameter on race_tool_span()
• When provided, �ction_ref is emitted as a span attribute

Properties:

• Recomputable - any implementation with the same four fields produces the same 64-char hex string
• Cross-producer - two independent runtimes for the same agent action yield the same �ction_ref
• Additive - complements gen_ai.tool.call.id without replacing it
• Non-breaking - the parameter is optional

Closes #7850

[Copilot]

Pull request overview

This PR extends autogen_core’s GenAI OpenTelemetry instrumentation to support cross-producer audit correlation by introducing a new span attribute (gen_ai.agent.action_ref) and providing a helper to deterministically derive that value.

Changes:

• Added GEN_AI_AGENT_ACTION_REF = "gen_ai.agent.action_ref" semantic-convention constant.
• Added derive_action_ref(...) helper to compute a deterministic SHA-256 hex digest from canonicalized JSON input fields.
• Extended trace_tool_span(...) with an optional action_ref parameter and emits it as a span attribute when provided.

[Hardik-369]

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