Add a JSON output format option to the route list command

[emmadesilva]

Fixes #1715 and opens up for more formats in the future, trying to match how Symfony does it.

Currently only the json format is added.

[
    {
        "page_type": "BladePage",
        "source_file": "_pages/404.blade.php",
        "output_file": "_site/404.html",
        "route_key": "404"
    },
    {
        "page_type": "BladePage",
        "source_file": "_pages/index.blade.php",
        "output_file": "_site/index.html",
        "route_key": "index"
    }
]

Of course, the output of this can also be redirected into a file stream:

$ php hyde route:list --format=json > routes.json

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (9bf132f) to head (26fa836).
Report is 1 commits behind head on master.

❗ Current head 26fa836 differs from pull request most recent head 5e4caf0

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1724   +/-   ##
=========================================
  Coverage     99.97%   99.97%           
- Complexity     1745     1748    +3     
=========================================
  Files           181      181           
  Lines          4661     4669    +8     
=========================================
+ Hits           4660     4668    +8     
  Misses            1        1           

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