Added new endpoint to create a user list from a link.

[benbdeitch]

Closes #9667

Currently, there's no endpoint to allow a logged-in user to add a new list without pattern-checking for their name. This poses a problem in the new Bulk Search feature, as it has to build the list in Vue, and getting access to the web.ctx.site variable (where that information is stored) is a non-trivial task in javascript. This PR sidesteps the problem, by creating a new endpoint in python to automatically redirect to the list creation endpoint for the currently logged in user.

Technical

Testing

To test, perform a bulksearch and create a list. With the current structure of how the Bulk Search component works, it'll always try to link to the main Open Library page. This will be fixed in a future PR, but for now, just edit the openlibrary.org portion of the URL to localhost:8080, or whatever you need for this particular test.

Screenshot

Stakeholders

@cdrini

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.73%. Comparing base (ce16a79) to head (3395b86).
Report is 144 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9670      +/-   ##
==========================================
+ Coverage   16.06%   16.73%   +0.67%     
==========================================
  Files          90       90              
  Lines        4769     4816      +47     
  Branches      832      840       +8     
==========================================
+ Hits          766      806      +40     
- Misses       3480     3487       +7     
  Partials      523      523              

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[cdrini]

Looking good! A few opportunities to simplify the code a bit.

[cdrini]

Lgtm! Didn't test my small code fix, but I think it shouldn't cause any issues.

Tested on testing and it redirected correctly to the new endpoint!