feat: add EnableChunkLoadingPlugin.{setEnabled,checkEnabled}

[colinaaa]

Summary

Implement EnableChunkLoadingPlugin.setEnabled and EnableChunkLoadingPlugin.checkEnabled APIs.

These APIs are useful for making custom chunk loading.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[codspeed-hq]

CodSpeed Performance Report

Merging #9092 will not alter performance

_{Comparing colinaaa:colin/0123/chunk-loading (83221c5) with main (66c5e0d)}

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Summary

✅ 4 untouched benchmarks