* Scheduler assumes that input is `FuncOp` which contains single
  `FuncOp`
* Scheduler constructs dependency graph using TTIR ops.
* This excludes ops like `ttnn.open_device`, `ttnn.close_device`, we
  need to find some way how to handle them i.e either scheduler puts
  them at the start/end of schedule or we handle them in some different way.
* Snapshotting creates deep copy of scheduler members
* Tested by creating pass which printed dependency graph of some more
  complex graph that was handcrafted (didn't include pass nor test code
  in PR but I can do if needed).