- r run mypy

[JayBazuzi]

Add mypy to run_tests + suppress all existing mypy violations.

Summary by Sourcery

Integrate mypy type checking into the project by adding it to the tox configuration and the CI workflow, while suppressing existing mypy violations.

Enhancements:

• Integrate mypy type checking into the testing process by adding a new 'type' environment in tox.

CI:

• Add mypy type checking to the CI workflow by including it in the 'run_tests.sh' script.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds mypy type checking to the project's test suite and suppresses existing mypy violations. The implementation involves configuring mypy rules in mypy.ini for various modules and integrating mypy into the tox test environment.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Configure mypy type checking rules	Add extensive module-specific error code suppressions Exclude .tox/ directory from mypy checks Configure base mypy settings for return type and config warnings	mypy.ini
Integrate mypy into the test infrastructure	Add new 'type' environment to tox configuration Configure mypy to check approvaltests and approval_utilities packages Add mypy command to run against specific packages	tox.ini run_tests.sh requirements.test.txt

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