Show instance for TypeReps is a bit broken

There are three problems.

1. Showing typereps of tuples can produce unnecessary parentheses:

   Prelude K T> typeRep @(Int, Maybe Bool)
   (Int,(Maybe Bool))

   The fix is trivial.

2. Showing typereps of ticked (i.e., lifted) tuples and lists gives hard-to-read results, because it does not use the usual special syntax:

   Prelude K T> typeRep @'(Int, Maybe Bool)
   '(,) * * Int (Maybe Bool)
   
   Prelude K T> typeRep @'[1,2,3]
   ': Nat 1 (': Nat 2 (': Nat 3 ('[] Nat)))

   Fixing the lifted tuple case is trivial. Fixing the lifted list case is slightly less trivial, but not hard.

3. Type operator applications are not shown infix.

   Prelude K T> typeRep @(Maybe :*: Either Int)
   :*: * Maybe (Either Int)

   This is the hardest problem to fix, although it's probably not too terribly hard. See ticket:14341#comment:143749 for thoughts.