Add tool for using the aws stepfunctions simulator

[Fryguy]

@kbrock @agrare Please take a look. I mostly just use this for testing .asl files and had a special helper for intrinsic functions, but we can expand it as needed in future PRs.

$ tools/step_functions
Run the aws stepfunctions simulator.

Notes:
  This tool requires the stepfunctions simulator to be installed locally and running.
  Installation instructions can be found at https://docs.aws.amazon.com/step-functions/latest/dg/sfn-local.html.

Commands:
  execute       Execute an .asl file through the stepfunctions simulator.
  intrinsic     Execute an intrinsic function or JSONPath standalone.

  For more help with a specific command use tools/step_functions <command> --help

Global Options:
  -h, --help    Show this message

$ tools/step_functions execute --help
Execute an .asl file through the stepfunctions simulator.

  -f, --file=<s>     The .asl file to execute (default: definition.asl)
  -i, --input=<s>    Input to the execution
  -h, --help         Show this message

$  tools/step_functions intrinsic --help
Execute an intrinsic function or JSONPath standalone.

  -f, --function=<s>    The intrinsic function or JSONPath to run
  -i, --input=<s>       Input to the execution
  -h, --help            Show this message

[Fryguy]

@agrare @kbrock As discussed I removed the stuff around managing the simulator itself, so now it's just a prereq to have it installed and running.

[miq-bot]

Checked commit Fryguy@4d2ff74 with ruby 3.1.5, rubocop 1.56.3, haml-lint 0.51.0, and yamllint
0 files checked, 0 offenses detected
Everything looks fine. ⭐