fix: update step performance metrics with explicit effective, input, output, and total token throughput fields

[lgrammel]

Background

Step performance metrics previously exposed a single output-token throughput value, which made it hard to distinguish full-request latency from streaming throughput after the first output arrived. This change makes the metrics more explicit so users can separately analyze effective request throughput, streaming output rate, input processing speed before first output, and total token throughput.

Summary

• Renamed tokensPerSecond to effectiveOutputTokensPerSecond.
• Renamed timeToFirstTokenMs to timeToFirstOutputTokenMs.
• Added outputTokensPerSecond, inputTokensPerSecond, and effectiveTotalTokensPerSecond.
• Updated generateText, streamText, lifecycle events, and telemetry to use the new performance fields.
• Updated docs and tests to describe and verify the new calculations.

Related Issues

Builds on and revises #15241

[github-actions]

🚀 Published in:

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