Enable data binding for the designer

[anna-dingler]

Related Issue

Fixes #6631

Description

Updated setValue and serialization methods so that values are not deleted from the propertyBag if GlobalSettings.enableFullJsonRoundTrip === true.

Note: Data binding will only work while in preview mode.

Sample Card

{
    "type": "AdaptiveCard",
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.5",
    "body": [
        {
            "type": "TextBlock",
            "text": "Image test:",
            "wrap": true
        },
        {
            "type": "Image",
            "url": "https://pbs.twimg.com/profile_images/3647943215/d7f12830b3c17a5a9e4afcc370e3a37e_400x400.jpeg",
            "width": "${imageSize}",
            "height": "${imageSize}"
        }
    ]
}

Data JSON

{
    "imageSize": "100px"
}

How Verified

Verified manually on the AdaptiveCards site

Microsoft Reviewers: Open in CodeFlow

[ghost]

Hi @anna-dingler. Thanks for helping make the AdaptiveCards JS renderer + tooling better. As additional verification, once the JS build succeeds, please go to the test site to test out your website/designer changes.