Add shell input meshing delay

Added 45 ms delay for input meshing to allow gesture launcher service to
detect consecutive key presses.

Async inject key event for input shell to prevent buttons from timing
out.

Bug: 279940768
Bug: 261737207
Test: adb shell input keyevent --async --delay 45 26 26 26 26 26
Test: adb shell input keyevent --async --delay 45 264 264 264
Change-Id: I3ec225baa017c65b5c7ef69efd7e98add5a02e6a