Function roaring_bitmap_to_uint32_array

pub unsafe extern "C" fn roaring_bitmap_to_uint32_array(
    r: *const roaring_bitmap_t,
    ans: *mut u32,
)

Convert the bitmap to an array, output in ans,

Caller is responsible to ensure that there is enough memory allocated, e.g.

ans = malloc(roaring_bitmap_get_cardinality(bitmap) * sizeof(uint32_t));