Parse input into data structure for core

[nartydev]

Note: this is blocked by #13

The input config and args must be parsed to be usable by the core.

By default, search inside config.json within the current directory.

{
  "request": {
    "url": "",
    "method": "",
    "body": {},
    "headers": [],
    "queryParams": []
  },
  "args": {
    "requestPerSecond": 10,
    "requestsCount": 100,
    "totalTimeout": 1000,
    "requestTimeout": 800
  },
  "metadata": {
    "collection": "",
    "label": ""
    "tag": "",
  },
}

Each parameter must be overridable by command line arguments (flags).

# look for config.json in root directory
runner

# pass explicit path to config file
runner --config path/to/file

# pass any option flag to override
runner -rps 20