Numpy2 draft

[YoungMind1]

I Wanted to share my the findings here.

• I think Cython upgrade is necessary according to this.
• Swapping except * and nogil in Cython files are due to compiler warnings, shouldn't affect anything.
• The addition of noexcept in many functions is due to the acquiring of gil to check exceptions. but in past versions of Cython functions without explicit declaration of except would "swallow" exceptions. so this change should not affect anything. related make gensim CI great again #3488 , Cython link
• 9 tests are failing, the one I really dug into was gensim/test/test_word2vec.py::TestWord2VecModel::test_similarities which should be due to changes in numpy datatype promotions link

I don't have the expertise or the time to fix these failing tests, just wanted to give a head start to anyone willing.
cc: @hechth
related #3562

[hechth]

@YoungMind1 thanks a lot, I'll merge your PR into mine locally and continue with the tests since you did complementary things. Thanks a lot!