Vector Sized

This package exports a newtype tagging the vectors from the vector package with a type level natural representing their size.

It also exports a few functions from vector appropriately retyped.

This package is fairly similar to the fixed-vector package. The difference is that fixed-vector uses Peano naturals to represent the size tag on the vectors and this package uses typelits.

The initial code for this package was written by @bgamari in a PR for vulkan