Test data for OME-Zarr RFC-5 transformations

[clbarnes]

Generate example input and output coordinate arrays for each transformation listed in OME-Zarr RFC-5 (to be included in v0.6 release).

• Ideally these would be presented in a language-agnostic format which closely aligns with the OME-Zarr serialisation of transformations so that tools can incorporate the test data into their own tests with little effort.
  • Define the input/output coordinates as e.g. numpy arrays (easy)
  • Serialise the OME-Zarr transform graph in a scene/ multiscales (easy-medium)
  • Describe and serialise the additional information needed by unit tests (medium)
• Stretch goal: we could use a similar strategy to the OME-Zarr conformance tests where implementations provide a very simple CLI which takes some input coordinate, transforms them, and writes them out, and we provide a tool which iterates through all the of examples, feeds them into the CLI, and checks the output.

Example of tests already in spatialdata: https://github.com/scverse/spatialdata/blob/cf91ad57b86f43aa8998ff7aa8ef1363972325d8/tests/transformations/ngff/test_ngff_transformations.py#L173

Examples of OME-Zarr configuration for different transforms: https://github.com/bogovicj/ngff-rfc5-coordinate-transformation-examples