5664-continuous_burst_mode_not_stopping_issue

issue: e/backlog#5664

When user long press capture button & start continuousBrustMode &
remove touch before cameraController start taking image, causes
unwanted behavior where burst-mode doesn't stop.

Here when user remove the touch should_run_continuous_fast_burst is
maintained. When 1 burst image is taken an event is passed EventBus to
the MainActivity. On listening the event, the flag is checked &
burst-mode stop called if necessary.