Speed up HIPSter by using Lightning Fabrics

[BerndDoser]

In the HIPSter two model functions are called:

• Generation of HIPS tiles (model.reconstruct -> decoder)
• Generation of catalog (model.find_best_rotation -> project -> encoder)

In Pytorch Lightning the accelerators are managed within the Trainer, which can not used in HIPSter, where the encoder and decoder are called directly.

[Lightning Fabrics]https://lightning.ai/docs/fabric/stable/) should bring the flexibility to use accelerators also in the HIPSter.