Create helper function for reading/loading downloaded files

[Dinghye]

Summary

Add a new helper function or module to facilitate reading and loading downloaded files within the project.

Motivation

Currently, users must manually process downloaded files. Introducing a standardized helper will simplify and streamline file handling, making integration with Remote Sensing Foundation Models easier and less error-prone.

Requirements

• A function (or set of functions) that accepts file paths and loads their contents appropriately.
• Support for common file formats expected in Remote Sensing workflows (e.g., CSV, GeoTIFF, JSON).
• Documentation and simple usage examples
• Integrate the helper with any existing downloading utilities if present.

Benefits

• Improved usability for data ingestion workflows
• Reduced code duplication
• Easier maintenance and extension

Additional Notes

If possible, align the implementation with the project's Python standards and existing utilities.

[amrit110]

@Dinghye, I looked at this and hoping I pick up this up. But before I work on this issue, I have a couple more PRs #65 and #66. One was just running the pre-commit which applied the prettier formatting. The other was something I noticed when tried getting embeddings on my mac. Please review them :).