[ENHANCEMENT] Customize the drop event handler

[clarkmcc]

Is your feature request related to a problem? Please describe.
Drag and drop functionality does not work when used in a Tauri app because of this issue. tauri-apps/tauri#2768 (comment)

Describe the solution you'd like
I'd like to customize how the drop event handler is registered, and provide a Tauri specific event handler.

import { listen } from '@tauri-apps/api/event'

listen('tauri://file-drop', event => {
  console.log(event)
})

[Dan86de]

Worth mentioning here is this event is triggered few times with same input. I currently have this problem on macOS dev mode.