Add PNG output support (Gets around the output size limitation of JPEG format)

[benclarkwood]

No description provided.

[benclarkwood]

Note, this only really adds support to carion, but the CLI could be easily wired up too.

[filitchp]

Running into some intermittent memory crashes in production. Trying a few things and meanwhile holding off on merging PR

[Systerr]

Hi. Thank you for your pull request. I'm not sure that using "outputFormat (0,1)" is good idea.
What do you thing of pass output formats and that format parameters as nested json?

{
    "input_url": "image-1.jpg",
    "operations": [
        {
            "type": "resize",
            "params": {
                "width": 230,
                "height": 2000,
                "type": "width",
                "interpolation":"cubic",
                "quality": 85,//keep for compatibility (not required)
                "output_url": "image-1-230.jpg",// keep compatibility (not required)
                "output"://new output option for multi format support  (not required)
                   [
                    {url:"image-1-230p.jpg",quality:85, progressive:true,optimize:true},
                    {url:"image-1-230.png",compression:9, strategy:"huffman"},
                    {url:"image-1-230.jp2",quality:85, progressive:true},
                    {url:"image-1-230.webp",quality:85},
                   ]
            }
        }
    ]
}

For carion we can provide a method like

getOutput(String,Buffer);
getOutput(".jpg",Buffer);

or keep one format as additional parameter
What do you think?
@benclarkwood @filitchp