Chapter on memory footprints of common types

Some resources:
 - https://wiki.haskell.org/GHC/Memory_Footprint
 - https://blog.johantibell.com/2011/06/memory-footprints-of-some-common-data.html
 - https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/rts/storage/heap-objects