Fix calibration metadata to use imglib2-realtransform

The imglib2-realtransform package is a robust transform-based way of supporting coordinate system transformations, including per-axis transformations but also much more.

We should retire the calibrated portions of the `net.imagej.axis` package, in favor of using `imglib2-realtransform`. There is probably code of value in `net.imagej.axis` that can be retooled in some way, but what we want to avoid is limiting ourselves to _only_ per-axis calibration support, since it is not powerful enough for many use cases.

Start by reviewing the calibrated portions of the `net.imagej.axis` package and the capabilities of `imglib2-realtransform`. Determine which existing calibration code remains valuable and define what retiring the calibrated portions should leave in place; done means coordinate transformations are no longer limited to per-axis calibration.

Written by the indexing model from the issue text.