Add IFS Analysis dataloader for training

[0xFrama]

Pull Request

Description

This PR adds a dataloader for the IFS Analysis dataset (for training). Each input/output data has the following size: [2048, 78].

This is an incomplete PR because what is missing is the second dataset (IFS HRES/ENS) for evaluation. I'm still in the process of calculating the mean and std for the latter.

I made this PR to show whether what has been done so far is fine or it needs some adjustment.

If this has to be a complete PR, you can close it and I can make a new one with what is missing.

Fixes #86

Checklist:

• [X] My code follows OCF's coding style guidelines
• [X] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X] I have checked my code and corrected any misspellings

[jacobbieker]

Sorry, again missed the notification, this looks good! I'll merge it.