Add an API to pass AudioFrameProcessor as a unique_ptr. Bug: webrtc:15111 Change-Id: I4cefa35399c05c6e81c496e0b0387b95809bd8f8 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/301984 Reviewed-by: Olga Sharonova <olka@webrtc.org> Reviewed-by: Markus Handell <handellm@webrtc.org> Reviewed-by: Henrik Andreassson <henrika@webrtc.org> Commit-Queue: Peter Hanspers <peterhanspers@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40187}