Add icechunk to tif conversion endpoint and S3 upload support

[suvanbanerjee]

Pull Request

Description

This PR adds the endpoint and logic to fetch files from Icechunk, convert them into TIFF format for UI display, and store the generated files in S3.

Chages needed in env

HISTORIC_SAT_S3_BUCKET=historical-cloud-data-geotiff
ICECHUNK_S3_BUCKET=nowcasting-sat-development
ICECHUNK_S3_PREFIX=odegree_v1/data/odegree_uk3000m.icechunk
AWS_DEFAULT_REGION=eu-west-1 <- this should be set by default on ec2 but on local we have to set it
ROUTERS=satellite

Checklist:

• My code follows OCF's coding style guidelines
• 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
• I have checked my code and corrected any misspellings

[braddf]

Looking good, some small comments to address once #321 is finalised