Change default imager to fastest CPU implementation

Corné Lukkenrequested to merge
set-default-imager-to-jax-ravel-real-jit into main

I propose this is the last change before I create a release wheel with a version so it can be installed in Jupyter on stations, @bassa is there any particular version number you had in mind 0.5.0? or 1.0.0 for instance.

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