xds: Add header mutations library#12494

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sauravzg wants to merge 19 commits intogrpc:masterfrom

sauravzg:feat/header-mutations

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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Commits on Mar 15, 2026

Fixup: 12492 Remove artifact from old channelcreds implementation and address nits.
sauravzg
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Commits on Mar 17, 2026

Commits on Mar 23, 2026

Fixup 12492: Refactor `allowedGrpcService` to be non optional and fix bug
sauravzg
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Commits on Mar 25, 2026