[TS][Renderer] Add TextRun.underline

[dclaux]

Related Issue

Fixes #3051
Fixes #3218
Fixes #3221

Description

Adds the underline property to TextRun

How Verified

Verified manually in adaptivecards-designer-app

Test payload:

{
    "type": "AdaptiveCard",
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.3",
    "body": [
        {
            "type": "RichTextBlock",
            "inlines": [
                {
                    "type": "TextRun",
                    "text": "Now you can have "
                },
                {
                    "type": "TextRun",
                    "text": "underlined text",
                    "underline": true
                },
                {
                    "type": "TextRun",
                    "text": " within a RichTextBLock"
                }
            ]
        }
    ]
}

As rendered:

Microsoft Reviewers: Open in CodeFlow

[ghost]

Hi @dclaux. 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.

[dclaux]

/azp run

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