ref(ai-agents-sdks): Specify agent span semantics

[alexander-alderman-webb]

DESCRIBE YOUR PR

The create agent description is copied from OTel: https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-agent-spans/#create-agent-span

The agent invocation description is a simplified description of the summary at the top of https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-agent-spans/

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