Add new BIND_ALLOW_BACKGROUND_ACTIVITY_STARTS binding flag

and the mechanism to use it

Since both starts and bindings might be contributing to the service
being whitelisted, track the state in ServiceRecord and update
the parent process accordingly when changes happen.

While we're at it, add that flag for bindings to accessibility
services, voice interaction services and QSTiles.

Also, make the timeout constant configurable for start-based
whitelisting.

Bug: 124298522
Bug: 123495976 (accessibility services)
Bug: 123337181 (paying via NFC, like Google Pay)
Bug: 122887611 (binding to InCallService)
Bug: 127774234 (binding to QSTile)
Bug: 124288681 (binding to voice interaction services)
Test: atest WmTests:ActivityStarterTests
Test: atest AccessibilityServiceConnectionTest
Test: manual with:
1) notifications from calendar and dynamite to test service starts
whitelisting
2) enabling talkback and livetranscribe to test service bindings
whitelisting
3) adding the LastPass QSTile and clicking on it
Change-Id: I8b6f23f999683920411ca40ab5b25c688a4f7055