[FEATURE REQUEST] add out keyword argument to math functions

[v923z]

Describe the solution you'd like
Going off-tangent with the feature request in adafruit/circuitpython#7995, add the out keyword argument to all math functions implemented in the vector module.

Additional context
Allowing to pass a pre-allocated array into functions would save on RAM, and execution time, while the implementation itself is trivial, and could be done with minimal flash space penalty, given that this could be done in

micropython-ulab/code/numpy/vector.c

Lines 35 to 46 in 3e996d9

	static mp_obj_t vector_generic_vector(mp_obj_t o_in, mp_float_t (*f)(mp_float_t)) {
	// Return a single value, if o_in is not iterable
	if(mp_obj_is_float(o_in) || mp_obj_is_int(o_in)) {
	return mp_obj_new_float(f(mp_obj_get_float(o_in)));
	}
	ndarray_obj_t *ndarray = NULL;
	if(mp_obj_is_type(o_in, &ulab_ndarray_type)) {
	ndarray_obj_t *source = MP_OBJ_TO_PTR(o_in);
	COMPLEX_DTYPE_NOT_IMPLEMENTED(source->dtype)
	uint8_t *sarray = (uint8_t *)source->array;
	ndarray = ndarray_new_dense_ndarray(source->ndim, source->shape, NDARRAY_FLOAT);
	mp_float_t *array = (mp_float_t *)ndarray->array;

where the output array is created.

An example can be found in https://numpy.org/doc/stable/reference/generated/numpy.fabs.html

[v923z]

Implemented in #621, closing now.