Make it possible to pass configuration to collectors (and reporters)

[kdzwinel]

It should be possible to pass configuration to collectors (and, less importantly, reporters) from the config file e.g.

{
    …
    "dataCollectors": ["requests", "apis", {id: "screenshots", settings: {fullPage: true}}],
    "urls": [
        {"url": "one.test", "dataCollectors": ["targets", {id: "screenshots", settings: {fullPage: false}}]},
        …
    ]
}

This is somehow blocked by #23