feat(backend): display tps ttft input_tokens and output_tokens in logs

[sl-gn]

📋 PR Title Format

The PR title should follow the format:

type(scope): concise message (max 50 chars)

Where:

• type is one of: feat, fix, docs, refactor, perf, test, chore.
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📝 Change Type

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• feat: New feature.
• fix: Bug fix.
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• perf: Performance improvement.
• test: Adding missing tests or correcting existing tests.
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💡 Description

display tps ttft input_tokens and output_tokens in logs

Key Changes

1. display tps ttft input_tokens and output_tokens in logs

🔗 Related Issues

#159