xds: Add configuration objects for ExtAuthz, GrpcService and Bootstrap changes for GrpcService#12492

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sauravzg wants to merge 3 commits intogrpc:masterfrom

sauravzg:feat/authz-config

Commits on Feb 2, 2026

feat(xds): Add configuration objects for ExtAuthz and GrpcService
sauravzg
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Commits on Mar 10, 2026

Fixup: Address comments from #12492
sauravzg
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Commits on Mar 12, 2026

Fixup: 12492 Split HeaderValueValidationUtils to GrpcService to match the updated requirements
sauravzg
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