Added class EncoderInfoSettings for parsing settings. Added use of class to SimulcastEncoderAdapter. Bug: none Change-Id: I8182b2ab43f0c330ebdf077e9f7cbc79247da90e Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/202246 Commit-Queue: Åsa Persson <asapersson@webrtc.org> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33050}