Add sensorEvent property to 'drag:stop' and 'drag:stopped' event

[bahung1221]

This PR implements or fixes:

Add sensorEvent property to drag:stop and drag:stopped event, that was described in the documentation (extended from DragEvent) but was missing (undefined) on drag:stop and drag:stopped event.

This PR closes the following issues

#324

Does this PR require the Docs to be updated?

No

Does this PR require new tests?

No. If we need a test to guarantee that all events have enough properties, we should include all events, not just drag:stop 🤔

This branch been tested on

Browsers:

• Chrome version
• Firefox version
• Safari version
• IE / Edge version
• iOS Browser version
• Android Browser version

[zjffun]

I modified the code here because drag:stopped also needs this fix.

[zjffun]

Thank you. @tsov This PR is ready to merge.

[Irina-Intuiface]

When will this be available? It seems it has been ready for more than a year now

[felsspat]

And it has been another year, I still can't access the sensor event in drag:stop or sortable:sort.

[felsspat]

I forked this (non-public) and added the change myself, I can confirm that it works and that I can now access sensorEvent:

  const dragStopEvent = new DragStopEvent({
      source: this.source,
      originalSource: this.originalSource,
      sensorEvent: event ? getSensorEvent(event) : null,
      sourceContainer: this.sourceContainer,
    });