Publish tariff_fetch on PyPI

[jpvelez]

What

Publish tariff_fetch on PyPI using semantic versioning.

Why

• tf is about to hit MVP status, and this make it easier to install for users
• Get in the flow of doing releases

How (optional)

• Register library with PyPI
  • @bryan did this for bsf I believe
• See how PyPI publishing via GHA works in bsf
• See how releases are done in bsf
• Do the releases
• Update docs
• Update README

Deliverables

• PyPI page
• Link to PyPI page at the top of README
• Working release badge the top of README
• 0.1.0 release on PyPI page, with release notes
• 0.1.0 release on Github repo, with release notes
• Updated install instructions in docs/ reflecting PyPI installs, see bsf example

[linear]

TF-12