### Description
Currently linting only takes place over the base unstructured directory
but we support python files throughout the repo. It makes sense for all
those files to also abide by the same linting rules so the entire repo
was set to be inspected when the linters are run. Along with that
autoflake was added as a linter which has a lot of added benefits such
as removing unused imports for you that would currently break flake and
require manual intervention.
The only real relevant changes in this PR are in the `Makefile`,
`setup.cfg`, and `requirements/test.in`. The rest is the result of
running the linters.
* Apply import sorting
ruff . --select I --fix
* Remove unnecessary open mode parameter
ruff . --select UP015 --fix
* Use f-string formatting rather than .format
* Remove extraneous parentheses
Also use "" instead of str()
* Resolve missing trailing commas
ruff . --select COM --fix
* Rewrite list() and dict() calls using literals
ruff . --select C4 --fix
* Add () to pytest.fixture, use tuples for parametrize, etc.
ruff . --select PT --fix
* Simplify code: merge conditionals, context managers
ruff . --select SIM --fix
* Import without unnecessary alias
ruff . --select PLR0402 --fix
* Apply formatting via black
* Rewrite ValueError somewhat
Slightly unrelated to the rest of the PR
* Apply formatting to tests via black
* Update expected exception message to match
0d81564
* Satisfy E501 line too long in test
* Update changelog & version
* Add ruff to make tidy and test deps
* Run 'make tidy'
* Update changelog & version
* Update changelog & version
* Add ruff to 'check' target
Doing so required me to also fix some non-auto-fixable issues. Two of them I fixed with a noqa: SIM115, but especially the one in __init__ may need some attention. That said, that refactor is out of scope of this PR.
