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Description
While the current codebase favors single quote strings, black cannot enforce that (only otherwise around). This PR replaces black by ruff which can enforce single quote for one-line strings, and double quote for docstring/other multiline string.
Other formatting behavior also changes, mainly assert no longer breaks at the strange location, multiple imports from the same location will be merged automatically, etc.
This PR will introduce major merge conflicts if added as-is.
isort's functionality is covered thus removed. flake8 doesn't seem to be really necessary but is kept just in case.
Type of change