feat: [DiscoveryEngine] add CMEK config service (#8358)

* feat: add CMEK config service
feat: add identity mapping service
feat: add user license config service
feat: add HealthcareFhirConfig to FHIR data store
feat: add ConnectorRunErrorContext to error log
feat: support structured content for chunk
feat: support ACL data store and document
feat: add more options for layout parser config
feat: support media recommendation engine
feat: enable claim level score for grounding
feat: add custom search operators for Workspace search
feat: add more indexing state for site search engine
docs: keep the API doc up-to-date with recent changes

PiperOrigin-RevId: 766759284

Source-Link: googleapis/googleapis@9953dde

Source-Link: googleapis/googleapis-gen@2a4efee
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