Add option for ReadBytes to read from an URL. In this way, the browser simulator can fetch the public keys from a static URL.
Add option for ReadBytes to read from an URL. In this way, the browser simulator can fetch the public keys from a static URL.

PiperOrigin-RevId: 384278308

google/privacy-sandbox-aggregation-service,google/privacy-sandbox-aggregation-service,google/privacy-sandbox-aggregation-service,google/privacy-sandbox-aggregation-service,google/privacy-sandbox-aggregation-service