Add portrait UI mode for Android & IOS that will be selected automatically runtime#120

sierpinskid merged 9 commits intomainGetStream/stream-video-unity:mainfrom

PBE-6312-Adjust-sample-project-UI-for-mobile-screensGetStream/stream-video-unity:PBE-6312-Adjust-sample-project-UI-for-mobile-screensCopy head branch name to clipboard