add hook to retrigger recompute of control zones manually

[cachesdev]

there is no way (that I can find) to recompute control zones manually in v3. this is needed in case you may have a resizable element with a drag handle, as the drag handle doesn't seem to recompute it's control area after resize.

[cachesdev]

this is the hack i've come up with to recompute allow zones on the fly. had to copy over some types as they are not exported. I use this on a callback for onResizeEnd in my resize attachment, it works fine. I tried to do this with compartments and an effect, it worked but sometimes it didn't recompute the allow zones.

  function recomputeDraggableZones() {
    if (ref && instances.has(ref)) {
      const data: ControlsPluginData = instances.get(ref)!.states.get('neodrag:controls');
      const { allow_zones, block_zones } = data.compute_zones();
      data.allow_zones = allow_zones;
      data.block_zones = block_zones;
    }
  }