Add prediction writer callback

[melisande-c]

The idea of creating a lightning prediction writer callback is to unify writing to TIFF and writing to ZARR.

The strategy for writing a to the different files can be decoupled from the prediction writer itself by creating write strategy interface, with concrete classes that can be an attribute of the prediction writer.

TODO:

• PredictionWriterCallback
• write strategies
  • WriteImage
  • WriteTiles
  • WriteZarrTiles
• File metadata extractors (mostly to extract the number of samples (i.e. tiff pages) per file)
• Reimplement CAREamist.predict_to_disk function