fix(observability): Emit OpenInference LLM cost lookup attributes for span exports#1988

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yczhang-nv:yuchenz/nat-274-phoenix-cost-tracking-missing-for-nat-llm-spans-becauseyczhang-nv/NeMo-Agent-Toolkit:yuchenz/nat-274-phoenix-cost-tracking-missing-for-nat-llm-spans-becauseCopy head branch name to clipboard