[Feature] Add `tooltip` to `Image` elements

Hi Team,

I was wondering if there is a way to display tooltip for an individual image. Like in this example from the samples.
Can the type image have a tooltip property?

{
 "items": [
                {
                  "type": "Image",
                  "id": "chevronDown${$index}",
                  "url": "https://adaptivecards.io/content/down.png",
                  "width": "20px",
                  "altText": "Details collapsed"
                },
                {
                  "type": "Image",
                  "id": "chevronUp${$index}",
                  "url": "https://adaptivecards.io/content/up.png",
                  "width": "20px",
                  "altText": "Details expanded",
                  "isVisible": false
                }
]
}

Start by locating the Image element definition and the renderer entry points for images. Review how existing image properties are handled and whether tooltip behavior is supported consistently across targets. Done means the requested property has documented behavior and the relevant renderers and tests cover it.