Session form image uploader

[yinonov]

• Let's add a module that handles image uploading and import it to our session form
• I recall google having an image uploader web component so that might be useful
• Use the firebase image resize extension
  https://firebase.google.com/products/extensions/storage-resize-images

[aravindfz]

The milestone for this is changed as it might take more time, for time being we will show a hint when the user uploads requesting the size to be standard.