Refactor into CoordinateTransformationInterface.jl and CoordinateTransformations.jl #100
Description
There are some cases in which it would be nice to have the abstractions of coordinate transformations without the overhead of StaticArrays and LinearAlgebra.
I could refactor to create a lightweight CoordinateTransformationInterface.jl as a subpackage here that folks can depend on, at least for API access. Would that make sense to folks here?