show: print types using exported type-aliases (#36107)

For example, this prints Array{T,1} as Vector{T} and Array{T,2} as
Matrix{T} and Base.GenericIOBuffer{Array{UInt8,1}} as IOBuffer,
and thus generalizes some existing code.

Co-authored-by: Kristoffer Carlsson <kristoffer.carlsson@chalmers.se>

src/pmap.jl

@@ -242,7 +242,7 @@ julia> b, c = Distributed.head_and_tail(1:10, 3)
 ([1, 2, 3], Base.Iterators.Rest{UnitRange{Int64},Int64}(1:10, 3))
 
 julia> collect(c)
-7-element Array{Int64,1}:
+7-element Vector{Int64}:
   4
   5
   6