arrays: move carray_to_varray from builtin, make it generic (#15503)

vlib/arrays/arrays.v

@@ -570,3 +570,12 @@ fn can_copy_bits<T>() bool {
 	}
 	return false
 }
+
+// carray_to_varray copies a C byte array into a V array of type `T`.
+// See also: `cstring_to_vstring`
+[unsafe]
+pub fn carray_to_varray<T>(c_array voidptr, c_array_len int) []T {
+	mut v_array := []T{len: c_array_len}
+	unsafe { vmemcpy(v_array.data, c_array, c_array_len * int(sizeof(T))) }
+	return v_array
+}