feat: Add LlamaIndex AgentWorkflow spans - #495
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Stacked on #494.
Adds
invoke_workflowspans forAgentWorkflowruns andinvoke_agentspans forFunctionAgentandReActAgentmember steps. Tool and provider inference spans remain in the same trace hierarchy instead of appearing as unrelated roots.Includes content, error, multi-agent handoff, VCR-backed provider composition, conformance coverage, and documentation.
Known concern: member
invoke_agentspans represent individualrun_agent_stepexecutions, so an agent emits another span when it resumes after a tool call.