Introduce build item to override weak reflection semantics

[geoand]

This is needed in cases where an extension might have more precise information that extension that originated the weak reflection semantics.

cc @goldmann who's kubernetes related use case lead to this (your extension would need to generate these build items for every Kubernetes API type it recognizes)

[gastaldi]

LGTM

[quarkus-bot]

This workflow status is outdated as a new workflow run has been triggered.

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