Mark all of Array's nogil cdef functions as noexcept (#502)

These are all pure C functions implemented in Cython. They do not raise. [Cython 3 adds checks for exceptions]( https://cython.readthedocs.io/en/latest/src/userguide/migrating_to_cy30.html#exception-values-and-noexcept ) in these functions, which is unnecessary given none of these set exceptions. So add `noexcept` to turn off these Cython checks.

Authors:
  - https://github.com/jakirkham

Approvers:
  - Mads R. B. Kristensen (https://github.com/madsbk)

URL: #502

python/kvikio/kvikio/_lib/arr.pyx

@@ -236,7 +236,7 @@ cdef class Array:
 cdef inline bint _c_contiguous(Py_ssize_t itemsize,
                                Py_ssize_t ndim,
                                Py_ssize_t[::1] shape_mv,
-                               Py_ssize_t[::1] strides_mv) nogil:
+                               Py_ssize_t[::1] strides_mv) noexcept nogil:
     cdef Py_ssize_t i, s
     if strides_mv is not None:
         s = itemsize
@@ -254,7 +254,7 @@ cdef inline bint _c_contiguous(Py_ssize_t itemsize,
 cdef inline bint _f_contiguous(Py_ssize_t itemsize,
                                Py_ssize_t ndim,
                                Py_ssize_t[::1] shape_mv,
-                               Py_ssize_t[::1] strides_mv) nogil:
+                               Py_ssize_t[::1] strides_mv) noexcept nogil:
     cdef Py_ssize_t i, s
     if strides_mv is not None:
         s = itemsize
@@ -270,7 +270,7 @@ cdef inline bint _f_contiguous(Py_ssize_t itemsize,
 cdef inline bint _contiguous(Py_ssize_t itemsize,
                              Py_ssize_t ndim,
                              Py_ssize_t[::1] shape_mv,
-                             Py_ssize_t[::1] strides_mv) nogil:
+                             Py_ssize_t[::1] strides_mv) noexcept nogil:
     cdef bint r = _c_contiguous(itemsize, ndim, shape_mv, strides_mv)
     if not r:
         r = _f_contiguous(itemsize, ndim, shape_mv, strides_mv)
@@ -283,7 +283,7 @@ cdef inline bint _contiguous(Py_ssize_t itemsize,
 @wraparound(False)
 cdef inline Py_ssize_t _nbytes(Py_ssize_t itemsize,
                                Py_ssize_t ndim,
-                               Py_ssize_t[::1] shape_mv) nogil:
+                               Py_ssize_t[::1] shape_mv) noexcept nogil:
     cdef Py_ssize_t i, nbytes = itemsize
     for i in range(ndim):
         nbytes *= shape_mv[i]