imageutils: Report format specific details when using JSON output format

The data held within this section is particularly useful when dealing
with encrypted LUKSv1, as shown below:

$ qemu-img info --output=json rbd:volumes/volume
{
    [..]
    "format-specific": {
        "type": "luks",
        "data": {
            "ivgen-alg": "plain64",
            "hash-alg": "sha256",
            "cipher-alg": "aes-256",
            "uuid": "de946b24-f318-4fa6-aacf-c5e97db04609",
            "cipher-mode": "xts",
            "slots": [
                {
                    "active": true,
                    "iters": 1966316,
                    "key-offset": 4096,
                    "stripes": 4000
                },
                {
                    "active": false,
                    "key-offset": 262144
                },
                {
                    "active": false,
                    "key-offset": 520192
                },
                {
                    "active": false,
                    "key-offset": 778240
                },
                {
                    "active": false,
                    "key-offset": 1036288
                },
                {
                    "active": false,
                    "key-offset": 1294336
                },
                {
                    "active": false,
                    "key-offset": 1552384
                },
                {
                    "active": false,
                    "key-offset": 1810432
                }
            ],
            "payload-offset": 2068480,
            "master-key-iters": 479636
        }
    },
}

Unfortunately the only documentation for this is in the QEMU codebase at
present, for example for LUKSv1:

https://github.com/qemu/qemu/blob/d8d5fefd8657d4f7b380b3a1533340434b5b9def/qapi/crypto.json#L272-L298

Related-Bug: #1861071
Change-Id: I133da07a5a9628b8a9338556939c858afae679f4

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