Implement Hearing Devices Quick Settings Tile (3/n)

This patch provides
* Manager to control when to show pair new device dialog
* Click on pair new device button to launch hearing device pairing page
* Add intent to open hearing device pairing page

Bug: 291423171
Bug: 319197158
Test: atest HearingDevicesDialogDelegateTest HearingDevicesDialogManagerTest
Flag: ACONFIG com.android.systemui.hearing_aids_qs_tile_dialog DEVELOPMENT
Change-Id: I17ab63942d5d98e59a46986137caeb7c0f8c4ed8