Module to retrieve Figshare metadata for public deposit (no token)

[astrochun]

Fixes #3

• Add figshare module
• Change figshare api routing to specify version
• Update docstrings in figshare module
• Add main script for uvicorn run
• Add figshare tests
• Add python-package GitHub action
• Simplify python-package GitHub action
• Fix coverage no data was collected issue
• Add additional data to figshare_metadata_readme

[astrochun]

This all looks good. I tested it manually too. In the future, we might want to add more automatic test cases.

Could you clarify what you mean by more automatic tests? pytest tests will run all existing unit tests.