Merge recent developments

[BDonnot]

Including:

• [BREAKING] the name of the python files for the "Chronics" module are now lowercase (complient with PEP). If you
  did things like from grid2op.Chronics.ChangeNothing import ChangeNothing you need to change it like
  from grid2op.Chronics.changeNothing import ChangeNothing or even better, and this is the preferred way to include
  them: from grid2op.Chronics import ChangeNothing. It should not affect lots of code (more refactoring of the kind
  are to be expected in following versions).
• [BREAKING] same as above for the "Observation" module. It should not affect lots of code (more refactoring of the kind
  are to be expected in following versions).
• [FIXED] an issue when copying the environment with the opponent (see issue Opponent seed is not propagated after env.copy() Grid2op/grid2op#274)
• [FIXED] a bug leading to the wrong "backend.get_action_to_set()" when there were storage units on the grid.
• [FIXED] a bug in the "BackendConverter" when there are storage on the grid
• [FIXED] issue There may be an error in 03_Action.ipynb Grid2op/grid2op#265
• [FIXED] issue AttributeError: Can't get attribute 'CompleteAction..."env_name"' => update the example notebook Grid2op/grid2op#261
• [ADDED] possibility to "env.set_id" by giving only the folder of the chronics and not the whole path.
• [ADDED] function "env.chronics_handler.available_chronics()" to return the list of available chronics
  for a given environment
• [ADDED] possibility, through the Parameters class, to limit the number of possible calls to obs.simulate(...)
  see param.MAX_SIMULATE_PER_STEP and param.MAX_SIMULATE_PER_EPISODE (see issue Count the number of use of "simulate" per step and globally Grid2op/grid2op#273)
• [ADDED] a class to generate a "Chronics" readable by grid2op from numpy arrays (see Add a possibility to load chronics from a numpy array Grid2op/grid2op#271)
• [ADDED] an attribute delta_time in the observation that tells the time (in minutes) between two consecutive steps.
• [ADDED] a method of the action space to show a list of actions to get back to the original topology
  (see Create a "get back to meshed topology"  Grid2op/grid2op#275)
  env.action_space.get_back_to_ref_state(obs)
• [ADDED] a method of the action to store it in a grid2op independant fashion (using json and dictionaries), see act.as_serializable_dict()
• [ADDED] possibility to generate a gym DiscreteActSpace from a given list of actions (see Discrete gym act space with given list of actions Grid2op/grid2op#277)
• [IMPROVED] observation now raises Grid2OpException instead of RuntimeError
• [IMRPOVED] docs (and notebooks) for the "split_train_val" In the notebook, explain the train / val / test split Grid2op/grid2op#269
• [IMRPOVED] the "split_train_val" function to also generate a test dataset see Improve split train / val / test Grid2op/grid2op#276

[BDonnot]

looks good

[sonarqubecloud]

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