wayland: Add MetaWaylandKeyboardGrab and keyboard grab API

This will be useful during DnD, where mutter is expected to consume
keyboard events for either allowing changes in the selected DnD action,
or misc a11y features like keyboard-driven DnD.

Currently, the vtable contains 2 functions, key() will be used on every
key event we get from Clutter, modifiers() will notify of changes in the
keyboard modifiers (mouse buttons will never be set in the modifier mask)

https://bugzilla.gnome.org/show_bug.cgi?id=760805

src/wayland/meta-wayland-types.h

@@ -29,6 +29,8 @@ typedef struct _MetaWaylandPointerGrabInterface MetaWaylandPointerGrabInterface;
 typedef struct _MetaWaylandPopupGrab MetaWaylandPopupGrab;
 typedef struct _MetaWaylandPopup MetaWaylandPopup;
 typedef struct _MetaWaylandKeyboard MetaWaylandKeyboard;
+typedef struct _MetaWaylandKeyboardGrab MetaWaylandKeyboardGrab;
+typedef struct _MetaWaylandKeyboardGrabInterface MetaWaylandKeyboardGrabInterface;
 typedef struct _MetaWaylandTouch MetaWaylandTouch;
 typedef struct _MetaWaylandDragDestFuncs MetaWaylandDragDestFuncs;
 typedef struct _MetaWaylandDataOffer MetaWaylandDataOffer;