Store RuntimeSetting in Aec Dumps.

Also read and apply settings when parsing and replaying dumps.

The implementation contains
* an extra field in debug.proto for the runtime settings
* code in AudioProcessingImpl to initiate the logging of the RS to the
  AecDump
* code in aec_dump/ to log the RS in the AecDump
* code in test/ for re-playing the RS. E.g. for APM simulation with
  audioproc_f.

Bug: webrtc:9138
Change-Id: Ia2a00537c2eb19484ff442fbffd0b95f8495516f
Reviewed-on: https://webrtc-review.googlesource.com/70502
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24647}

modules/audio_processing/include/aec_dump.h

@@ -98,6 +98,9 @@ class AecDump {
   virtual void WriteRenderStreamMessage(
       const AudioFrameView<const float>& src) = 0;
 
+  virtual void WriteRuntimeSetting(
+      const AudioProcessing::RuntimeSetting& runtime_setting) = 0;
+
   // Logs Event::Type CONFIG message.
   virtual void WriteConfig(const InternalAPMConfig& config) = 0;
 };