Implementation of new My Lists Design

[benbdeitch]

Closes #7704

Technical

This pull request refactors code from #7743, and adds a new section of mybooks where a user's first three lists are graphically previewed. The list object in openlibrary/core was given a new method that caches a small dictionary with memcached for up to ten minutes, containing a dict with near-minimal data for each list.

Testing

Simply create a list, and navigate to your 'My Books' page. Importantly, there are some situations in which covers will not load; certain methods of adding a book to one's list add a Work, rather than an Edition. Works seem to rarely have associated covers, so will rarely display correctly. I was advised that solving that is outside of the scope of this Pull Request, so I'll merely be documenting my currently known methods.

Currently known ways that add a work;

• The edit UI of the list.
• The Solr Book Search

Currently known ways that add an edition: -navigating to an edition page, and manually adding the book via the 'want to read' dropdown.

Screenshot

Stakeholders

@mekarpeles

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 16.01%. Comparing base (d376947) to head (ddbdf60). Report is 217 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8725      +/-   ##
==========================================
- Coverage   16.62%   16.01%   -0.62%     
==========================================
  Files          88       89       +1     
  Lines        4698     4696       -2     
  Branches      837      820      -17     
==========================================
- Hits          781      752      -29     
- Misses       3399     3436      +37     
+ Partials      518      508      -10     

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[scottbarnes]

Heads up @cdrini, you may wish take into account the PR found here: #7743.

[mekarpeles]

This one may need to be rebased, I'm seeing a lot of pyc files checked in!