examples/deepzoom: parallelize deepzoom_tile to available CPUs
#297
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On Python 3.13+, and on all Python versions on Linux, set the default job count to the number of available CPUs. Otherwise, default to 4 jobs as before.
Also: if OpenSlide Python is type-checked on Windows,
os.add_dll_directory()will exist and mypy will complain. Add an extra ignore to fix this. Mypy understands conditionalizing onsys.platformbut not onos.name, and we want the latter because it exactly corresponds to whether the function exists.