CI/MAINT: add a CI job with ASan and UBSan on macOS, fix one UB issue #836
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…s math UBSan report: ``` ../pywt/_extensions/c/wt.template.c:105:43: runtime error: addition of unsigned offset to 0x60d00022bbd0 overflowed to 0x60d00022bba0 pywt/tests/test_multidim.py::test_dwdtn_idwtn_allwavelets PASSED SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../pywt/_extensions/c/wt.template.c:105:43 Fatal ```
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UBSan report:
For context: the motivation for this added CI was the hang observed at #828 (comment)