[IMP] web_editor, web_unsplash: improve media-dialog UX

Previously, searching for images in the database and on unsplash was
mutually exclusive, and controlled by a dropdown menu next to the search
bar. Additionally, the display of db images and unsplash images was very
different, making using the search function inconsistent and awkward.

This commit merges the unsplash search into the db search. When
searching, the first few matches from the database are displayed, then
results from unsplash.

Additionally, the layout of images has been greatly improved,
eliminating almost all padding, using some flex-box magic to allow the
images to take up all the available space without being cropped or
deformed.

The input to add an attachment by URL is now collapsed by
default, and clicking on it will expand it to reduce visual clutter.

Finally, when not in multi-images mode, the clicked image is immediately
used, rather than the user having to click it and then click the add
button, or having to double click, which was not obvious.

task-2091417
closes odoo/odoo#45174

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