stdlib: add support for stacklevel (#763) #95

Job	Run time
Build & verify package	1d 0h 0m 0s
Verify dev env (ubuntu-latest)	1s
Verify dev env (windows-latest)	1s
Ensure 100% test coverage	1d 0h 0m 1s
Visual check for color settings using env variables	0s
Run doctests	0s
Check types using supported type checkers	0s
Tests & Mypy API on ${{ matrix.python-version }}	-1s
Ensure everything required is passing for branch protection	1s
	2d 0h 0m 3s

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