Fix WM input limitations on secondary displays (3/4)

One DisplayContent contains one InputMonitor now.
- Change setInputWindow of InputManagerService updated by displayId,
  so Window Handles in InputDispather can be updated by each DisplayContent.
- Only exist one focus in current state, reset it if in removed DisplayContent,
  will be updated by default display or focused display.
- Add displayId parameter for createInputConsumer and destroyInputConsumer,
  so InputConsumer from PIP, RecentApp and Wallpaper can be supported in multi-display.

Bug: 111363643
Test: atest WindowManagerSmokeTest ActivityManagerMultiDisplayTests
Test: atest com.android.server.wm.DisplayContentTests
Test: atest libinput_tests inputflinger_tests
Change-Id: I999c355be1789af5759f00206475d004e10116e3