setManifestInterceptor
open override fun setManifestInterceptor(interceptor: ManifestResponseInterceptor?, diagnose: ManifestInterceptDiagnose)
Provide the customer manifest-response interceptor (and a diagnostic sink for when it throws). The SDK forwards OptiViewAdsConfig.interceptManifestResponse here at construction; sources apply it after parsing, on the initial fetch and every poll. Default no-op so custom sources need not support it.