feat(kruise): add restConfigQPS, restConfigBurst and image.pullPolicy to manager values

[Uburro]

Summary

Add manager.restConfigQPS, manager.restConfigBurst, and manager.image.pullPolicy
as configurable Helm values for kruise-manager.

Previously, REST client QPS/burst limits and image pull policy were hardcoded in the
chart templates and could not be overridden without patching the chart directly.

Changes:

• Add manager.restConfigQPS (default: 30) — maps to --rest-config-qps flag
• Add manager.restConfigBurst (default: 50) — maps to --rest-config-burst flag
• Add manager.image.pullPolicy (default: Always) — replaces hardcoded imagePullPolicy: Always
• Update README.md to document all new parameters

Upstream reference: https://github.com/openkruise/kruise/blob/25caf571230c581d76b27ccc782c5331cb917c2c/main.go#L76-L77

Affected versions: next, 1.9.0-alpha.4

Checklist

• I have bumped the chart version according to versioning
• I have updated the chart changelog with all the changes that come with this pull request according to changelog.
• Any new values are backwards compatible and/or have sensible default.
• I have signed off all my commits as required by DCO.

[kruise-bot]

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[kruise-bot]

Welcome @Uburro! It looks like this is your first PR to openkruise/charts 🎉