Value semantics for AOD tracking.

It would be great to switch from reference to value semantics on all quantum statements:

```mlir

%state_1 = tracking.play(%state, %path)
%state_2 = tracking.tophat_cz(%state, %zone)
...


```

The main purpose of this dialect would be to enable AOD tracking via dataflow analysis. 


This can also be an intermediate dialect to support #35 in the future. 