Add minizip and extract .npz files

[minhqdao]

• Interface with minizip to handle zip extraction (can be reused for other matrix formats).
• Write tests for zip extraction.
• Load .npz files.
• Add tests for loading entire .npz files.
• Add examples.
• Polish code.
• Build minizip from source.
• Add documentation.

Related Issues:
#486
#763

Future Endeavors:

• Compress zip files.
• Save .npz files.
• Use zip interface to load and save other matrix formats.