[Automatic cell sizing] Master task for auto-sizing cells / estimated cell sizing and auto-sizing supplementary views

There are known issues with auto-sizing / auto-layout / estimated size cells in IGListKit.

A number of issues have been opened:
#487, #508, #266, #463, #452, #588, #739, #864, #906

We'll track and discuss all auto-sizing bugs/problems in this task to consolidate the discussion.

---------

If any new issues are opened regarding this, please close and redirect here. 😄

Start by reviewing the related issues #487, #508, #266, #463, #452, #588, #739, #864, and #906, since this issue is a master task rather than a standalone defect. Compare their auto-sizing, auto-layout, estimated-size-cell, and supplementary-view discussions to identify an unresolved problem. Done means addressing a specific tracked issue and updating or redirecting the consolidated discussion.

Written by the indexing model from the issue text.