Move deprecated EventWrapper to modules/video_coding/deprecated/

This move further clarifies that the file and its class are deprecated. It also cleans up the modules/video_coding root folder a bit.

No functional changes are intended.

Bug: webrtc:14876
Change-Id: Ieb6effd55f0ecba17cefc2f07f5eda1e85dbd016
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/296441
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39535}
diff --git a/modules/video_coding/deprecated/BUILD.gn b/modules/video_coding/deprecated/BUILD.gn
index c9f226d..5859902 100644
--- a/modules/video_coding/deprecated/BUILD.gn
+++ b/modules/video_coding/deprecated/BUILD.gn
@@ -29,6 +29,14 @@
   ]
 }
 
+rtc_library("deprecated_event_wrapper") {
+  sources = [
+    "event_wrapper.cc",
+    "event_wrapper.h",
+  ]
+  deps = [ "../../../rtc_base:rtc_event" ]
+}
+
 rtc_library("deprecated_jitter_buffer_common") {
   sources = [ "jitter_buffer_common.h" ]
 }