add mypy and other static code analysis checks to pre-commit

[avendesora]

Description

Added mypy and other static code analysis checks to pre-commit and fixed any reported errors/warnings.

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [x] I have run pre-commit locally prior to submission and fixed any errors/warnings.
• [x] I have run tests locally prior to submission and they are passing.
• [x] I have added necessary documentation (if appropriate).
• [x] I have updated the README (if appropriate).
• [x] I have updated the CHANGELOG (if appropriate).
• [x] I have updated the version number (if appropriate).
• [x] I have updated the requirements (if appropriate).