Add support for Scarlatti top row virtual key event keycodes

These keycodes are the default top row keys supported on the
Scarlatti layout.

See go/scarlatti-top-row for UX mocks

Bug: 429240027
Test: N/A

Flag: com.android.hardware.input.create_virtual_keyboard_api

Change-Id: I69955883d51bd093e55528df599295d93f336b10