[3.13] gh-125997: Increase test coverage for `time.sleep()` (GH-128751) (#128796)

gh-125997: Increase test coverage for `time.sleep()` (GH-128751)

- Add tests for durations of invalid types.
- Add tests for `int` and `float` durations, including signed zeroes durations.
- Add tests for nonzero very small durations and durations close to the clock resolution.

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(cherry picked from commit b70a567575db37846beecbe8b40fb56b875274db)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>