add a note about remote-helpers in crate-status (#1666)

`gix-protocol` should support it one day, probably with a
crate implementing the protocol, which is then used from
the functionsin the crate. Ideally abstracting it fully.

Author: Byron

crate-status.md

@@ -462,6 +462,7 @@ Check out the [performance discussion][gix-traverse-performance] as well.
         * [x] delegate can support for all fetch features, including shallow, deepen, etc.
         * [x] receive parsed shallow refs
 * [ ] push
+* [ ] remote helper protocol and integration
 * [x] API documentation
     * [ ] Some examples