Lists (#5703)

* Add structure for lists

* Add list timeline streaming API

* Add list APIs, bind list-account relation to follow relation

* Add API for adding/removing accounts from lists

* Add pagination to lists API

* Add pagination to list accounts API

* Adjust scopes for new APIs

- Creating and modifying lists merely requires "write" scope
- Fetching information about lists merely requires "read" scope

* Add test for wrong user context on list timeline

* Clean up tests

spec/services/batched_remove_status_service_spec.rb

@@ -30,11 +30,11 @@ RSpec.describe BatchedRemoveStatusService do
   end
 
   it 'removes statuses from author\'s home feed' do
-    expect(Feed.new(:home, alice).get(10)).to_not include([status1.id, status2.id])
+    expect(HomeFeed.new(alice).get(10)).to_not include([status1.id, status2.id])
   end
 
   it 'removes statuses from local follower\'s home feed' do
-    expect(Feed.new(:home, jeff).get(10)).to_not include([status1.id, status2.id])
+    expect(HomeFeed.new(jeff).get(10)).to_not include([status1.id, status2.id])
   end
 
   it 'notifies streaming API of followers' do