Added CTS Verifier test for Instant Apps notification.

Design doc: go/instant-cts-verifier.
Two other tests will be added in similar fashion using different instruction text.

What's included:
1. A sample Instant App under //cts/apps/CtsVerifierInstantApp
2. make cts-verifier will install the sample Instant App via adb install --instant
3. Added Instant Apps test category with one test.

Bug: 128338329
Test: make cts-verifier
Test: manual test
Change-Id: I55264a59dea86faa5d6c34be01ff1802a8e49213
(cherry picked from commit c7f7aa0721b7bbcc64b2b08deb124f5ced269aa0)
11 files changed