Added the laser hockey env

[PacoSchatz]

I had a first go at adding the laser hockey env.

As far as I can tell it works. The agents each send a random action and play against each other.
I changed the _observation in IGame to also receive a player-index, as the observation is inverted for the second player.
While I was at it I also changed the Game class to know its game_ID and protocol to properly transmit this ID to the clients.

@Cari1111 and I both ran into the following error while installing the laser-hockey-env.:
'Failed building wheel for box2d-py'
for me, this was fixed by creating a new venv, installing swig with pip install swig, and then pip install . to install the laser-hockey-env.

Things that can still be improved/are worked on :

• I couldn't find how to retrieve the score of the game from obs or info, so the _player_stats function doesn't return anything useful yet.
  --> moved to Return score in laser-hockey game class #56.

• I didn't change any of the parameters when creating the env. These may be changed to best fit our use case.

• Currently the errors for the laser-hockey package about missing library stubs or py.typed marker are suppressed in the pyproject.toml . Further information can be found here.
  Maybe we can have a go at automatic stub generation for the laser-hockey package

• Add swig in the pyproject.toml file, as it might be required for the laser-hockey-env

[Cari1111]

Thanks for your implementation. Comments on the changes:

1. Laser hockey
   I tested the implementation locally and it works realy good. I would only change the name of the class name of the agent class.

2. game_id
   The game ID is now send to the client from the game class instead of a permanent dummy value. This change was important and was implemented well.

3. General cleannup
   The updated and corrected comments are very good.

I have two little changes that I requested below.