Implement creating an edge with handler::depends_on()

[EwanC]

Our specification defines that when using handler::depends_on() during node creation, passing an event returned from queue recording, will create a node edge.

This functionality needs to be implemented in the prototype and tests added to https://github.com/Bensuo/llvm-test-suite/tree/intel/SYCL/CommandGraph

Currently handler::depends_on is causing segfaults when using record & replay graph creation with oneDNN

[Bensuo]

Partially implemented in #100 for the record and replay API only.