[MAINTENANCE] usage-stats, & utils.py typing

[Kilo59]

Changes proposed in this pull request:

• breakup pyproject.toml mypy packages (in exclude)
• core/usage_statistics typing
• utils.py typing

TypeGuard

This PR is our first use of a custom TypeGuard (PEP 647). Which is a way to give the type-checker additional details about the kind of type-narrowing a custom is_<SOMETHING> function was performing.

https://mypy.readthedocs.io/en/stable/type_narrowing.html?highlight=TypeGuard#user-defined-type-guards

My initial PR made several of these is_<SOMETHING> functions into TypeGuards, but I reverted them. https://github.com/great-expectations/great_expectations/pull/5925#discussion_r962095170

Numpy types

Definition of Done

• [x] My code follows the Great Expectations style guide
• [x] I have performed a self-review of my own code

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