[3.12] gh-111295: Fix error checking in time extension module init (GH-111296) (#111300)

gh-111295: Fix error checking in time extension module init (GH-111296)

Introduce ADD_INT macro wrapper for PyModule_AddIntConstant()
(cherry picked from commit 81b03e78101c97c1d3fe5f90908bbf94e83d7df1)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>