🚀 Feature

The ignite.contrib module is the last one, which is ignored by the mypy config 💪 For anyone, who wants to do it, I would recommend to split it in 3-4 PRs

• ignite.contrib.engines
• ignite.contrib.handlers
• ignite.contrib.metrics
• (Optional separate PR) ignite.contrib.metrics.regression

After that we could also enable more stricter mypy configuration to further improve the typing of the project.

So, feel free to ask any questions here or in your PRs, I will try my best to give proper guidance and @vfdev-5 will do the same for sure, like he did with my previous PRs 👍