Add agent version

[nikhilNava]

Task
Add agent version attribute to support evals

[github-actions]

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[Copilot]

Pull request overview

Adds an agent_version dimension to the observability SDK so agent/version can be attached to spans (and propagated via baggage allowlists) to better support evaluation scenarios.

Changes:

• Introduces GEN_AI_AGENT_VERSION_KEY and GEN_AI_CALLER_AGENT_VERSION_KEY constants.
• Extends AgentDetails with an optional agent_version field and records it on spans.
• Adds baggage support/allowlisting for propagating agent version (and caller-agent version for invoke-agent scenarios).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/trace_processor/util.py	Adds agent/caller-agent version keys to the attribute allowlists used by the span processor.
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/opentelemetry_scope.py	Records gen_ai.agent.version on spans when provided via AgentDetails.
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/middleware/baggage_builder.py	Adds fluent API to set agent version in baggage.
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/invoke_agent_scope.py	Records caller-agent version on invoke-agent spans when provided via CallerDetails.
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/constants.py	Defines the new attribute keys for agent and caller-agent version.
libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/agent_details.py	Adds agent_version: Optional[str] to AgentDetails.