Sebastian Jansson 72b7524d87 Adds more stats to CallStatsCollector.
Also adding checks to avoid adding empty stats.

Bug: webrtc:10365
Change-Id: I37ab32a3d4271fcad419f17841a8d2e524d73245
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133020
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27625}
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