Expose `normalize` to skip having to import LinearAlgebra.jl

[cvigilv]

The need to import an entire package to do something as simple as normalizing hypervectors is a pain for UX. I'm constantly needing to import LinearAlgebra (even though I'm not using it), which makes coding with the package a little worse than it should be.

I propose exposing LinearAlgebra.normalize directly from within the package, using an alias, e.g.:

# Within some relevant spot in the codebase
using LinearAlgebra

HyperdimensionalComputing.normalize = LinearAlgebra.normalize

Fairly straightforward, but it improves the UX a fair bit if you want to do something with HDC.jl and maintain a project as minimal as possible.