feat(behaviors): Adding global-quick-tap-ms for combos

This brings the 'global-quick-tap' functionality to combos by filtering
out candidate combos that fell within their own quick tap term.

I also replaced `return 0` with `return ZMK_EV_EVENT_BUBBLE` where appropriate.
(I assume this was done in past as it is similar to errno returning, but
being that this is to signify an event type I find this more clear)

app/dts/bindings/zmk,combos.yaml

@@ -18,6 +18,9 @@ child-binding:
     timeout-ms:
       type: int
       default: 50
+    global-quick-tap-ms:
+      type: int
+      default: -1
     slow-release:
       type: boolean
     layers: