Add method 'genSizedList' to class Foldy

[TimSheard]

Extends the Foldy class with a new method genSized list.
Removed many redundant constraints in Constrained.Base.hs
This allows one to solve constraints like

sum3 = constrained $ \ [var|xs|] -> [sum_ xs ==. lit 6 + lit 9 + lit 5, sizeOf_ xs ==. 5]  

Where a list that is being summed, can also have its size constrained.

Checklist

• Commits in meaningful sequence and with useful messages
• Tests added or updated when needed
• CHANGELOG.md files updated for packages with externally visible changes
  
  New section is never added with the code changes. (See RELEASING.md)
• Versions updated in .cabal and CHANGELOG.md files when necessary, according to the
  versioning process.
• Version bounds in .cabal files updated when necessary
  
  If you change the bounds in a cabal file, that package itself must have a version increase. (See RELEASING.md)
• Code formatted (use scripts/fourmolize.sh)
• Cabal files formatted (use scripts/cabal-format.sh)
• hie.yaml updated (use scripts/gen-hie.sh)
• Self-reviewed the diff