Make FlowUtils (and Flowkit) compatible with NumPy >= 2.0

[BastienDussap]

Hi,
FlowUtils (and therefore Flowkit) are blocked to (at best) numpy=1.26 because of the change in its C API. This PR updates the package to ensure compatibility with NumPy version 2.0 and above.

What changes have been made?.

In both _logicle.c and gate_helpers.c :

• Replaced outdated NPY_IN_ARRAY with NPY_ARRAY_IN_ARRAY
• Use PyArrayObject instead of PyObject when calling C functions like PyArray_DATA
• Change the way we throw exception if the array doesn't exist

In the setup files:

• Set the minimum NumPy version to 2.0 in pyproject.toml and setup.py.
• Add the tag -DNPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION in the extra_compile_args
  -> This new version must be compiled with numpy>=2.x, but the python can be used with older versions of numpy (at least 1.26 works for me).

Breaking changes
The package now requires NumPy >= 2.0 to compile the C files. Older versions are no longer supported.

How was this tested?
I use run_test.py, no changes where made in the unit tests.

Bonus
In gate_helpers.c you mention that the algorithm you use for points_in_polygon is based on a website. But this website now seems to be a scam.