Include bubble changes in ranking & move flagging to BubbleExtractor

Previously, only changes to the "allowBubbles" on the channel or
package would trigger a ranking change. This bit only indicates that
the notification is allowed to bubble -- it doesn't indicate that
the notification *is* a bubble. To allow active notifications to
become bubbles if the user changes the setting, we need to
flag them in response to ranking changes.

This CL moves the bubble flagging code into BubbleExtractor that
way the flag is always updated during ranking changes.

BubbleController listens to ranking changes and adds / removes bubbles
based on the ranking. The ranking needs to have an isBubble bit on
it because ranking changes won't pipe flag updates through. SysUI
uses this bit to flag the entry on SysUI's side.

Moves the shortcut getting / validating code into a helper class.

Also removes the inline reply requirement.

Test: NotificationManagerTest NotificationManagerServiceTest BubbleExtractorTest ShortcutHelperTest BubbleCheckerTest
Bug: 149736441
Change-Id: Ib5b62923c123187ae5f7073ec7ca50d7e20c04b1
Merged-In: Ib5b62923c123187ae5f7073ec7ca50d7e20c04b1