[READY] adds strategy viz cli

[big-c-note]

@fedden
Added a vizualization to the cli. It is an extension of what you started building years ago. Get started with poker_ai viz

Here's an example:

strat_dag_viz_.mov

This shows a visualization of the bot's strategy starting with at flop. Colors are showing states the bot visited.

Importantly I had to add data for the current betting stage to the strategy to make this happen. I was careful to make sure it affected no other modules, and all tests pass. I also trained a new bot and played it in the terminal with these changes.

Information

"""
  Create a vizualization of a bot's strategy in your browser. You can get
  started with the provided test data without any flags.
  >>> poker_ai viz
  Prerequisites
  -------------
  - You must have a strategy trained via the `poker_ai cluster` and `poker_ai
  train` commands in addition to the repo's installation instructions. Though,
  there is test data included for the `poker_ai viz` command when the
  `strategy_dir` is None.
  - You'll need to get an infoset to vizualize, you can copy one from the
  output of the strategy.
  >>> strategy = joblib.load('path/to/strategy_dir/agent.joblib')
  >>> strategy['strategy'].keys()
  Make sure to user '' around the infoset so it can be parsed by your shell.
  Example.

'{"cards_cluster":9,"betting_stage":"turn","history":[{"pre_flop":["raise",
"raise","raise","call","call"]},{"flop":["raise","raise","fold","call"]},{
"turn":["raise","raise"]}]}'

For details on the accepted arguments and defaults.
>>> poker_ai viz --help
Options:
--strategy_dir PATH  Path to the strategy directory.
--info_set_str TEXT  Infoset to vizualize, you can copy one from the output
                     of the strategy.
                     >>> strategy =
                     joblib.load('path/to/strategy_dir/agent.joblib')
                     >>> strategy['strategy'].keys()
                     Make sure to user '' around the infoset so it can be
                     parsed by your shell.
                     Eg; '{"cards_cluster":1,"betting_stage":"flop","history
                     ":[{"pre_flop":["call", "call","call"]}]}'
--max_depth INTEGER  Max depth of the viz.  Recommend 7 or less, as the tree
                     grows exponentially (~^3)
--host TEXT          The interface to bind to.
--port INTEGER       The port to bind to.
--help               Show this message and exit.
"""

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