Typing charm.py

[PietroPasotti]

Typed ops/charm.py

Minor changes to framework.py and vendor/yaml.py types as well.

Checklist

• Have any types changed? If so, have the type annotations been updated?
• [n/a] If this code exposes model data, does it do so thoughtfully, in a way that aids understanding?
• [n/a] Do error messages, if any, present charm authors or operators with enough information to solve the problem?

QA steps

tox -e static

Changelog

• Statically typed charm.py

[rwcarlsen]

This looks like it maybe was built on top of the relation keys typing PR. Could you rebase it so this only has the charm.py typing commits?

[PietroPasotti]

This looks like it maybe was built on top of the relation keys typing PR. Could you rebase it so this only has the charm.py typing commits?

Done!

[rwcarlsen]

Pretty good, just a few relatively minor things.