* feat(rtc-stats): send camera off timestamp to service * code review * improve error handling * improve rtcstats middleware and complete typescript types
* fix(face-landmarks): stop recognition when imageCapture error * ref(face-landmarks): convert files in typescript fix: lint issues * code review * ref(face-landmarks): move detection part to a class * ref(face-landmarks): make FaceLandmarksDetector singleton * fix typo and ts-ignore problematic types * fix linting issues