Standard message format

[TTycho]

This is an idea for a more standarized message format. It is just a PoC right now.

{
    "source":"provider",
    "responses": [
        {
            "paragraph":"subtitle",
            "preamble":"introduction to source",
            "data": [
                {"category":"category", "datapoint":"datapoint", "stixtype":"ipv4-addr", "value":"value"},
                {"category":"category", "datapoint":"datapoint", "value":"value"}
            ]
        }
    ]
}

Converts to a message text and possibly an attachment.
The text can have multiple paragraph with a short introduction. This can also be ommitted

[TTycho]

This should probably be something with objects.

[spierenburg]

PR27-STRUCTURED-OUTPUT-PROPOSAL.md