Only update rows when they have changes, and not whenever any part of the datasource changes

[radubrehar]

Note

Medium Risk
Changes core DataSource row update notification semantics and adds deep-equality comparisons, which could impact rendering correctness/performance and CI behavior due to auto-pushing baseline files.

Overview
Improves row-level update behavior in DataSource by introducing a RowInfoStore diffing mechanism that deep-compares rowInfo objects and only notifies subscribed row indices when their rowInfo meaningfully changes (instead of on any dataArray update).

Adds CI-managed performance baselines: introduces examples/perf-baselines.ci.json plus a CLI (examples/scripts/perf-baseline.js) and npm scripts to manage baselines, and updates the GitHub Actions test workflow to auto-commit baseline updates after runs.

Also updates example/test harnesses (e.g. huge-updates.page.tsx update controls, additional columns/fields, and a small Playwright timeout bump) to better exercise/validate the new update behavior.

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