Fix WM input limitations on secondary displays (2/N)

For one DisplayContent contains one InputMonitor now.
Store InputWindowHandles divided by displayId.
setInputWIndow will be updated by displayId
instead of updating all windows from all displays.

Bug: 111363643
Test: atest WindowManagerSmokeTest ActivityManagerMultiDisplayTests
Test: atest libinput_tests inputflinger_tests
Change-Id: I336945abdd36a543207e15650264280b04253eef