Introduce StreamInterface::FireEvent for firing stream events

This is a step towards removing StreamInterface::SignalEvent.
Downstream dependency will need to be updated to call FireEvent()
before further changes can land in webrtc.

Bug: webrtc:11943
Change-Id: Ia7d3f1c43fda52b7cf5bfa082aef3f462553cd67
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/347884
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42143}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index c582863..69b4343 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -1446,8 +1446,11 @@
   deps = [
     ":buffer",
     ":checks",
+    ":logging",
     ":threading",
     "../api:array_view",
+    "../api:sequence_checker",
+    "system:no_unique_address",
     "system:rtc_export",
     "third_party/sigslot",
   ]