Bouncer - Intercept touch events when not visible

There is a moment, when swiping on the lockscreen, that the bouncer
showing state is set to true but it isn't quite visible. In this
state, it is possible to interact with it.

Only allow interaction if the bouncer is at least 90% visible.

Also, refactor bouncer repository to an interface and add a
FakeKeyguardBouncerRepository so it can be tested with coroutines.

Test: atest PrimaryBouncerInteractorTest
PrimaryBouncerInteractorWithCoroutinesTest
Fixes: 260820843

Change-Id: I78cdf14521cc8cd02b6f2ab06e7ca518c92718c0