fix(sensor): return early when the target isn't in handle or draggable elements

[zjffun]

This PR implements or fixes #463

https://codesandbox.io/s/tiptap-prosemirror-draggable-issue-forked-ewp1x

This PR closes the following issues #463

Does this PR require the Docs to be updated?

Yes

Does this PR require new tests?

Yes

This branch been tested on... (click all that apply / add new items)

Browsers:

• [x] Chrome
• [x] Firefox
• [x] Safari version
• [x] IE / Edge 11
• [x] iOS Browser version
• [x] Android Browser version

[zjffun]

Hi @bahung1221, Could you please help me review this PR when you have free time?

[zjffun]

Thank you. I added it and other options in doc.