Accept box_tuple_t in box C APIs

[e-ivkov]

Is your feature request related to a problem? Please describe.

When I already have a tuple of box_tuple_t type that I got from tarantool interface I want to be able to supply it as an argument to box_insert, box_replace. So that it will not be needed to first offload tuple contents to buffer and only then call box_*. Offloading to buffer causes performance and memory overhead.

Describe the solution you'd like

To add function:

int box_replace_tuple(uint32_t space_id, box_tuple_t *tuple, box_tuple_t **result)

In addition to already existing:

int box_replace(uint32_t space_id, const char *tuple, const char *tuple_end, box_tuple_t **result)

Similarly do it for box_insert

Describe alternatives you've considered

Change the interface of box_replace. But I don't see the need to break compatibility over this.

Additional context

box_replace docs

Definition of Done

box_insert_tuple and box_replace_tuple functions added to C API