Add functions for extracting multi-part archive

[giswqs]

This PR adds functions for downloading and extracting multi-part archives. This can be useful downloading deep learning pre-trained models (>2GB) from GitHub. Use the following command to create a multi-part archive and upload to GitHub as assets for releases.

zip -s 10m sam_hq_vit_tiny.zip sam_hq_vit_tiny.pth

import leafmap

files = ["sam_hq_vit_tiny.zip", "sam_hq_vit_tiny.z01", "sam_hq_vit_tiny.z02", "sam_hq_vit_tiny.z03"]
base_url = "https://github.com/opengeos/datasets/releases/download/models/"
urls = [base_url + f for f in files]
leafmap.download_files(urls, out_dir="models", multi_part=True)

[github-actions]

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