Minor improvements

[isinyaaa]

Some improvement suggestions from a quick look around. Tested with existing tests, but I still haven't been able to run e2e.

[tarilabs]

thanks @isinyaaa much appreciated !

I'm not a big fan of reformattings, but I'd take it.

Can you kindly clarify/help me better understand the followings:

• simplify type annotations 1c7f52f
  to me that is python 3.10 and up: https://peps.python.org/pep-0604
  btw, not sure why mypy is not complaining about this 🤔

• provider: skip mode-setting before download_blob b95b014
  why would I skip mode=w here for file which I want to write, please? 🤔 asking for improving my py knowledge! :D

About the E2E test failure, see below:

[isinyaaa]

thanks @isinyaaa much appreciated !

I'm not a big fan of reformattings, but I'd take it.

I can disable my auto-formatter if you prefer, but having some sort of style guidelines would be helpful for contributions.

Can you kindly clarify/help me better understand the followings:

• simplify type annotations 1c7f52f
  to me that is python 3.10 and up: https://peps.python.org/pep-0604
  btw, not sure why mypy is not complaining about this 🤔

when you declare from __future__ import annotations it enables forward compatibility for type annotations.

• provider: skip mode-setting before download_blob b95b014
  why would I skip mode=w here for file which I want to write, please? 🤔 asking for improving my py knowledge! :D

You don't need it because oras is already opening that file in the required mode (w+b, not w).

[tarilabs]

thanks for the clarification @isinyaaa , can you please reword your commits to sign-off for DCO, ...or just squash them if easier to add the required DCO

[tarilabs]

many thanks again, proceeding to merge