[Ongoing Call Controller] Add a #dump method with current call

information.

Sample output:

    Active call notification: CallNotificationInfo(key=0|com.google.android.dialer|1|null|10142, callStartTime=1632773848984, intent=Intent { act=android.intent.action.MAIN flg=0x10040000 cmp=com.google.android.dialer/com.android.incallui.LegacyInCallActivity (has extras) }, uid=10142, isOngoing=true)
    Call app visible: false

Bug: 199600334
Test: Manual
Change-Id: I2ade3280a60f83138d79349828168dd00ed6b623