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/fan_out_on_write_service_spec.rb

@@ -19,12 +19,12 @@ RSpec.describe FanOutOnWriteService do
   end
 
   it 'delivers status to home timeline' do
-    expect(Feed.new(:home, author).get(10).map(&:id)).to include status.id
+    expect(HomeFeed.new(author).get(10).map(&:id)).to include status.id
   end
 
   it 'delivers status to local followers' do
     pending 'some sort of problem in test environment causes this to sometimes fail'
-    expect(Feed.new(:home, follower).get(10).map(&:id)).to include status.id
+    expect(HomeFeed.new(follower).get(10).map(&:id)).to include status.id
   end
 
   it 'delivers status to hashtag' do