integrating graph simulator

[Krastanov]

@AthenaCaesura, @ScottPJones

Notes from live discussion with Athena Caesura

not all of these will be done in the near term

• structure represent a state
• constructors for stabilizer state -> graph state and for graph state -> stabilizer state (partially already in the library, but probably with slightly different conventions compared to what you have set up)
• apply!(..., ::SingleQubitCliffordOps), apply!(..., ::TwoQubitCliffordOps)
• projectX! and projectY! and projectZ! (probably currently done by converting to stabilizer state
• fancy trickery with better local complementation choices by Athena

Future longer term tasks that will be added to a new issue when this starts gaining momemtum

• fancy trickery with teleportation for avoiding graphs that are too dense
• apply!(..., ::CliffordOperator) (if even possible?)
• graph-native implementations of project! (not in the near term)