Detailed topological information

[BDonnot]

TODO for this feature:

• [x] being able to compute the position of the switches given the "topo_vect" vector (done, for standard importer for ieee grid)
• [x] being able to compute the topo_vect / shunt_bus from the the position of the switches (super slow -loops in python- but working)
• [x] being able to act directly on the switches (regular grid2op action)
• [ ] some work on the "observation" module, especially, to avoid translating topology over and over again between switches and "topo_vect"
  • [ ] make "topo_vect" a property
  • [ ] make a property for the switches
  • [ ] add two attributes that stores the switches configuration (if any) or the switch configuration (if any)
  • [ ] code the accessor of topo_vect / switch_position based on previous info
• [ ] documentation
• [ ] tests
• [ ] example on how to use this feature (would be in beta at first release)
• [ ] notebooks

/!\ in the case only the "topo_vect" info is given, the "switch_position" will be inferred from the topo_vect (and possibly the last known switch state). In this case we need to add a flag to say that it's not "THE" switch position but it's "A" switch position.

Then :

• [ ] integration with gym_compat module
• [ ] test
• [ ] doc
• [ ] performance improvment