Documentation and plotting recipes for the various `AbstractECCSetup`

[Krastanov]

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In #212 we use subtypes of AbstractECCSetup to define how an error-correcting code will be compiled into a circuit (e.g. to simulate various approaches to fault tolerance). Examples of this are Shor syndrome measurements with or without flag qubits or simply direct non-fault-tolerant syndrome measurements. These all need:

• [ ] dedicated documentation page that goes through the different approaches and includes circuit diagrams
• [ ] visualization tools (probably with Quantikz.jl) that immediately show what these circuits are
• [ ] better string representations in the REPL for these types