Image name popup: displaying file extension separately

[sivaschenko]

Story

#328 [Story #26] User sets the image name

Preconditions

1. Install Magento with Adobe Stock Integration
2. Configure the integration in Stores -> Configuration -> System -> Adobe Stock Integration fieldset

Steps to reproduce

1. Login to admin panel
2. Open Magento Media Gallery (i.e. go to Cms -> Pages, edit the page and insert image)
3. Click "Search Adobe Stock" button to open images grid
4. Click on any image to expand image preview
5. Click on "Save Preview" button

Expected result

A popup to set image name opens. The popup should be redesigned to match the following mockup (file extension should be displayed as field suffix, maximum popup width should not exceed 700px):