This has a few advantages:

* It's now possible to save the interpolation strategy in a variable
  and easily re-use it.

* We can now freely add more type parameters to the `quantile*`
  methods as needed without making them more difficult to call.

* We now have the flexibility to add more advanced interpolation
  strategies in the future (e.g. one that wraps a closure).

* Calling the `quantile*` methods is now slightly more compact because
  a turbofish isn't necessary.

This is slightly more versatile because `ArrayBase` allows arbitrary
strides.

Co-Authored-By: LukeMathWalker <LukeMathWalker@users.noreply.github.com>