File sending and uploading progress bar

[Alisonispig]

The user cannot know the upload progress of the current file. When sending the file, you can add a slot or parameter to display the upload progress

[antoine92190]

Fixed in 9286b97

[antoine92190]

To use it, you need to pass progress property to the message file in messages prop.
See 422ca5a
Once the progress in finished, you need to remove the progress property or set it to null.