feat: Generate StateMachine diagram from cmd line

[fgmacedo]

Generate a StateMachine diagram from the command line.

❯ python -m statemachine.contrib.diagram --help
usage: diagram.py [OPTION] <classpath> <out>
Generate diagrams for StateMachine classes.
positional arguments:
  classpath   A fully-qualified dotted path to the StateMachine class.
  out         File to generate the image using extension as the output format.
optional arguments:
  -h, --help  show this help message and exit

Examples:

python -m statemachine.contrib.diagram tests.examples.guess_the_number_machine.GuessTheNumberMachine number.pdf

number.pdf

python -m statemachine.contrib.diagram tests.examples.guess_the_number_machine.GuessTheNumberMachine number.png