docs: record soldr build benchmark

[zackees]

Summary

• add a local soldr benchmark for building fbuild-cli and fbuild-daemon
• document cold, warm cache, no-op, and fresh-target timings
• link the new doc from the docs README and FAQ index

Testing

• Not run; documentation-only change.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 7d5b1a23-9f61-409c-949c-929a386ad2ff

📥 Commits

Reviewing files that changed from the base of the PR and between f13fc0b and b3888cb.

📒 Files selected for processing (3)

• docs/INDEX.md
• docs/README.md
• docs/SOLDR_BUILD_PERF.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/soldr-build-benchmark

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