Add new APIs for launching Wallet on power double tap.

Adds a new API method to QuickAccessWalletService: the method returns a
PendingIntent which can be sent when double tap gesture is detected.

Test: atest QuickAccessWalletClientTest
Bug: 378469025
Flag: android.service.quickaccesswallet.launch_wallet_option_on_power_double_tap

Change-Id: I2777f0e9e16fc7ab7e7c216cdeaa4a74db95dbaf