Return live thumbnail URL for everyone

[mjh1]

@victorges does this playback info response look ok to you, the thumbnail source I mean:

{
    "type": "live",
    "meta": {
        "live": 0,
        "source": [
            {
                "hrn": "HLS (TS)",
                "type": "html5/application/vnd.apple.mpegurl",
                "url": "https://livepeercdn.studio/hls/b7caqhzl06ma2iqn/index.m3u8"
            },
            {
                "hrn": "WebRTC (H264)",
                "type": "html5/video/h264",
                "url": "https://livepeercdn.studio/webrtc/b7caqhzl06ma2iqn"
            },
            {
                "hrn": "Thumbnail",
                "type": "image/jpeg",
                "url": "https://storage.lp-playback.studio/raw/juixm77hfsmhyslrxtycnqfmnlfq/catalyst-recordings-com/hls/b7caqhzl06ma2iqn/303c14b0-0b12-4275-8228-dbea616fe82a/source/latest.jpg"
            }
        ]
    }
}

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Name	Status	Preview	Comments	Updated (UTC)
livepeer-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 10, 2023 0:26am

[victorges]

LGTM

@mjh1 WDYT of adding a specification on the hrn [1] with the content type, similar to HLS and WebRTC?
i.e. Thumbnail (JPEG) (then we can also add other formats later if we want)

[1] I always forget what that means, and it's not a general thing. Just found a DM with Jaron where he told me it just means "Human Readable Name". WDYT of adding a comment (description) in our api-schema explaining that it just means that?

[mjh1]

@victorges I had added this before:

studio/packages/api/src/schema/api-schema.yaml

Line 2115 in a123439

- Thumbnail

That's what you mean right, I can just rename it to Thumbnail (JPEG)