Register TDA target parameters as loss module buffers

[recisic]

Description

This PR introduces registration of the TDA target parameters (target_centers and target_sigmas) as buffers within the TDALoss module.

• Eliminates the need to convert both parameters to tensors and move them to the current device for each loss calculation step
• Enables retrieval of target parameters from saved DeepTDA CV checkpoints or traced modules

Status

• Ready to go

[EnricoTrizio]

Ciao Juno, that looks great! I'll merge and close. Thanks for the help 🚀