This PR implements the functionality to build graphs only in an area of interest (AOI).

This includes:

• A new node builder, CutOutZarrDatasetNodes, which allows to create nodes from 2 zarr datasets using cutout operation from anemoi-datasets.
• A new class, KNNAreaMaskBuilder, to specify an AOI based on a set of nodes, for which we can specify node attributes to mask the nodes of interest.
• A new set of node builders, LimitedArea...Nodes, which allows the creation of the nodes only within an Area Of Interest (AOI).
• Expanding the MultiScaleEdges functionalities to support multi-scale connections in limited area graphs.

Checklist before requesting a review

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation and docstrings to reflect the changes
• I have added tests that prove my fix is effective or that my feature works
• I have ensured that the code is still pip-installable after the changes and runs
• I have ran this on single GPU
• I have ran this on multi-GPU or multi-node

Issue ticket number and link

Issues #7

This work would not have been possible without @theissenhelen and @JesperDramsch and the rest of the AIFS team!

📚 Documentation preview 📚: https://anemoi-graphs--30.org.readthedocs.build/en/30/