[IMP] base_import: Import images via URL

Task 32132

Currently, importing image requires either uploading them
one-by-one (after the initial import), scripting that upload, or
converting all images to base64 and putting that in the import
file (leading to a huge unreadable file) before actually doing the
import.

This is problematic for non-technical users, especially when they're
deploying or synchronising e-commerce products.

This change matches URLs in image fields and goes to read the URL &
load that as image data. It performs the read inline which is reactive
but means the imports will be very slow (wallclock) as each URL will
have to be fetched and encoded.

Configuration: via config file only

* import_image_timeout (seconds, default 3), initial connection timeout (not
  overall file download)
* import_image_maxbytes (bytes, default 10MB): maximum image size to
  download, checked before download (Content-Length) and validated
  during (in case Content-Length is missing)
* import_image_regex (str), matches field content as "probably an
  image", by default checks that the field value starts with
  http|https and ends with an image-type extension (e.g. bmp, png, jpg)

Hard Limits:

* only works on fields actually called "icon", "image", "logo" or
  "picture"
* the image can't be more than 42MP (checked after all data is
  downloaded)

Hooks:

* _can_import_remote_urls (on res.users) checks whether the current
  user is allowed to import via URLs
* _import_image_by_url (on base_import.import) performs the actual
  download, could be overridden to store urls to import and
  batch/queue the actual imports

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