[Tasks] Display timestamps

[mbrown1413]

Display timestamps for

• Time since task started
• Message, in seconds since start

You'll need to update times in real-time in vue, like in this blog post

You'll need a way to format times nicely. StackOverflow question

• moment.js looks nice. It points out that it's not a modern library anymore though, so it lists alternative recommendations
• relative-time - Very small implementation which uses Intl.RelativeTimeFormat under the hood. Consider basing an implementation on this instead of using it directly.
• javascript-time-ago
• Intl.RelativeTimeFormat - Browser API. Looks like it does have an "auto" option. I'll have to see if it's up for the job without some support code around it.