int_conv: Fix specific scalar conversion and support more scalar type

int_conv: Add more integer type binding and add a unit test

changelog: Add changelog entry

int_conv: Manage int8_t and long on Windows

int_conv: Try to use stdint type to manage long hack on windows

int_conv: Fix Windows build

int_conv: Try to fix Mac build and don't compile twice 64 bits integer on Mac and Windows

int_conv: Don't use np.dtypes (introduced in numpy 1.25)

int_conv: Test long and int difference in unit test

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int_conv: Expose long in MacOS

int_conv: Don't use deprecated type np.intc

int_conv: Fix Mac build

int_conv: Remove int128 (doesn't exists)

int_conv: Disable long long test on Mac because the type is not reachable

int_conv: Begin to work on promotion

int_conv: Add unsigned promotion

int_conv: Manage complex promotion

int_conv: Split matrix binding to avoid memory issue while building

int_conv: Split decomposition binding to avoid memory issue while building

int_conv: Use clongdouble instead of complex256

int_conv: Avoid out of heap space error on Windows

int_conv: Fix test for Mac

int_conv: Try to manage longlong on Mac and int on Windows, also reduce compile time

int_conv: Manage Windows and Mac int and long long when casting

int_conv: Allow scalar to complex conversion

int_conv: Manage casting from numpy to eigen with tensor

int_conv: Add changelog entries

int_conv: Remove conversion from Eigen to Numpy

int_conv: Add reference to this PR

int_conv: Activate SciPy tests by default