🚀 Feature

Idea is to setup type checking of the codebase with mypy with our Travis CI (here) :

mypy --config-file mypy.ini

• At the first iteration we can ignore most of the errors with mypy.ini. Example of mypy.ini. => done Setup Mypy check at CI step #1296

• For other iterations, let's set ignore_errors = False for a module (e.g. [mypy-ignite.utils.*]) (see mypy.ini) and fix mypy errors.

For Hacktoberfest contributors, feel free to ask questions for details if any and say that you would like to tackle the issue.
Please, take a look at CONTRIBUTING guide.