Add functionalities to debug a stim circuit

[MarcSerraPeralta]

• Isolate individual detectors from of a circuit to be plotted individually and see if they look as expected
• Convert logicals to detectors and plot them
• Compute the max weight hyperedge in a DEM to see if it makes sense
• Remove gauge detectors from dems and circuits
• A way to plot some error in the circuit to see its location
• Check if a DEM instruction (decomposed and undecomposed) is in a DEM
• Get the DEM instructions present in one DEM but not in another one
• Check if a decoding graph has disconnected subgraphs
• A way to get the qubit label from the qubit ind (maybe this should be in the Layout class?)
• All faults in a stim DEM trigger max two detectors

[MarcSerraPeralta]

Instead of adding this set of tools into a debugging module, I believe that it is better to divide them into some more specific modules (because they can be used not only for debugging but for other purposes).
I propose the following: detectors, dems, and plotting (?). For the latter, I am still unsure because the performance module contains a plots.py file inside it, to it does not make sense to have a both a general and specific plotting, becayse then one does not know where to find the tools.

[MarcSerraPeralta]

Maybe a better classification of the modules it is regarding the inputs of the functions. For example, in a dems module, the inputs of the functions are dems (with other arguments). I believe this simplifies the problem because it is easier to access the functions as one only needs to know what is the input/object it wants to transform/operate on.