Supporting the leadingComments array

[austinkregel]

Hello!
First off, thank you for your work here. It's saved me many hours of figuring out how to do this myself 😄

I am trying to build a small program to generate PHPUnit tests based off of the class, right now the only thing really preventing me from implementing anything is having the leadingComments supported

"leadingComments": [
    {
        "kind": "commentblock",
        "value": "/**\n * Class " + classObject.name + 'Test' + "\n * @package Tests\\Unit\\Console\\Commands\\ADFRequest\n */"
    }
],

My company uses declare(strict_types=1); and has a comment above it for a file comment and right now the unparser doesn't support any kind of leading comments.

Here is what the parser generates:

{
        "kind": "program",
        "children": [
                {
                    "kind": "declare",
                    "leadingComments": [
                        {
                            "kind": "commentblock",
                            "value": "/**\n * Tests the class\n */"
                        }
                    ],
                    "children": [],
                    "what": {
                        "strict_types": {
                            "kind": "number",
                            "value": "1"
                        }
                    },
                    "mode": "none"
                },
                // Other class item
       ]
}

And in PHP it would look like this:

<?php
/**
 * Tests the class
 */
 declare(strict_types=1);

Adding support for the leading comments would be deeply appreciated.