Image Recommendations: Bottom Modal Sheet

[mazevedofs]

Phabricator: https://phabricator.wikimedia.org/T356818

Notes

• This PR adds the bottom sheet component for Image recommendations
• On iPad and iPhone landscape, I'm considering an out-of-the-box approach for now until I get more input from design (Update: separate tickets were created for those items)
• On the WKImageRecommendationBottomSheetView, in order to calculate the exclusion path to place the image on this almost columnar layout, it was necessary to calculate the size of the other view elements: the link button and the image view. I tried to keep the code as readable as possible, I'm open to suggestions here.
• I'm not loading the Image on the image view, the image view is in gray color for now to help visualize the layout. Fetching, loading, and caching the image properly will be done in a separate ticket https://phabricator.wikimedia.org/T358933, since we need to build all the infrastructure for it

Test Steps

1. Launch the app on Staging or Experimental (I've been testing with English and Spanish)
2. Click the notifications button. You should see the modal sheet
3. Make sure you can swipe up to make it bigger, but it can't be dismissed
4. Test with larger fonts and other themes
5. Click "Not sure". Verify that the next suggestion loads correctly
6. Make sure you can scroll and reach the view article button on the article view
7. On iPad - it shouldn't break
8. The yes, no, and link buttons are not on the scope of this task, so they have no action

[tonisevener]

Looking good! I have mainly minor things. I have an alternative approach to avoid the sizing calculations you mentioned, but I didn't notice any layout bugs on how it's acting currently so it can be optional.

I also notice a crash with these steps:

1. Go to first recommendation on iPhone (I've been testing iPhone 15 Pro simulator). Tap "View article"
2. Go back, then tap "Not sure"
3. App crashes.

[tonisevener]

I see some constraint errors in the console when these are set, but so far I haven't figured out what's causing it.

[tonisevener]

We're going to merge to unblock dependent tasks. Feedback will be addressed in a followup PR.