* Install missing deps. In the future we probably just want to reuse
the dev environment (e.g. poetry shell) to have same result for hook
and explicit execution in venv.
* Mypy: Initial support
* Add to pre-commit (currently installs own deps, could maybe changed
to poetry venv in the future to reuse environment and don't need
duplicated types deps).
* Add type hints.
* Mypy: Add missing annotations
- Added recommended settings for the Pylance and Pyright extensions
- Enabled pytest and debugging support in configuration
- Reformatted code with Prettier
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Co-authored-by: Chris <git@nootch.de>