Adding new flag for routes task to output routes as JSON

[jwoertink]

Purpose

Fixes #1852

Description

This adds a new optional output format to print the routes of your app as a JSON structure that looks like

lucky routes --with-params --format=json

[
  {
    "method": "GET",
    "path": "/",
    "action": "Home::Index",
    "params": []
  },
  {
    "method": "POST",
    "path": "/alerts",
    "action": "Alerts::Create",
    "params": [
      {
        "name": "title",
        "type": "String"
      }
     ]
  }
]

Checklist

• - An issue already exists detailing the issue/or feature request that this PR fixes
• - All specs are formatted with crystal tool format spec src
• - Inline documentation has been added and/or updated
• - Lucky builds on docker with ./script/setup
• - All builds and specs pass on docker with ./script/test