Add type information to LoggingContext.__call__

[sapslaj]

Adds a DecoratedCallable TypeVar and uses that in the type hints for the __call__ method in LoggingContext. This allows type information to pass through correctly when used as a decorator.

It seems like the @wraps decorator on the wrapper mangles the type info so I had to disable type checking on the return because Pyright was convinced it was wasn't the correct type, but the tests proved otherwise.

I'm not sure there's a good way to test since at runtime the function signature is getting passed through correctly. It's only on the type checking pass that things break down. It's probably fine as-is since no tests broke as a result, but figured it was worth mentioning.

Fixes #60

[sapslaj]

Looks like pre-commit failed in CI. I ran it manually on my local machine and it's passing, so looks like it's a CI issue and not something wrong with this PR.

$ pre-commit run -a
Trim Trailing Whitespace.................................................Passed
Fix End of Files.........................................................Passed
Check Yaml...............................................................Passed
Check for case conflicts.................................................Passed
Check JSON...............................................................Passed
Check for merge conflicts................................................Passed
Debug Statements (Python)................................................Passed
black....................................................................Passed
isort....................................................................Passed
flake8...................................................................Passed
bandit...................................................................Passed
pyupgrade................................................................Passed