Support Json Structure for Analytics Events

[JohannesPtaszyk]

We are using a custom analytics structure, which relies on a JSON being sent from the client, rather then key-value pairs.
It would be really neat to support in the library + ui JSON, which then gets parsed in different levels of tables in the UI.

Something like:

{
    "screen": {
        "current":  "Product Detail",
        "previous": "Product List",
        ...
    }
}

An idea would be to introduce some new function, like analyticsProperty e.g. "jsonAnalyticsProperty" which would then render a proper json structure into a nested table view or something like that.