This CL replaces the existing `WebRTC.Audio.ApmAnalogGain.*` stats with `WebRTC.Audio.Apm.AppliedInputVolume.*` and adds the `WebRTC.Audio.Apm.RecommendedInputVolume.*` stats. Bug: webrtc:7494 Change-Id: I70be710d20b1589fc814cbce3d3329ac1500686f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/280220 Reviewed-by: Hanna Silen <silen@webrtc.org> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38468}