Add support for dropzonejs widget with Media Library in core

Problem/Motivation

Requested by Razem
#3051658: Make dropzonejs widget available to the new Media Library in core

Now that Drupal 8.7 is out with the new Media Library module, it would be great to support dropzonejs file upload widget in the Media Library. Similar to how it's done in Entity Browser.

Proposed resolution

Make dropzonejs widget available to the new Media Library in core

User interface changes

Image

Local Video

File or Docs

Audio

API changes

Media library add form Class for DropzoneJS support

Data model changes

None