Shift to keycode and modifierState attrs in bookmarks.xml

Use keycodes and modifier state in bookmarks.xml instead of
legacy shortcutChar and shift xml params

Test: atest InputTests
Test: atest WmTests
Bug: 358569822
Flag: EXEMPT refactor
Change-Id: I15dcf179476a99e15f3bb3cbc9deef26a2da96d7
12 files changed