[Cocoa] Add runtime logging for PlaybackSessionMangager and VideoFullscreenMangager and their proxies
<rdar://problem/108427487>
Pull request: https://github.com/WebKit/WebKit/pull/13082
Committed 263773@main (8877cb0fb4d4): <https://commits.webkit.org/263773@main> Reviewed commits have been landed. Closing PR #13082 and removing active labels.