Add support for links in deferrals.update

[Sasino97]

Add support for links in regular deferral.update calls (without AdaptiveCards)

deferrals.update("[Label](https://example.com)");

Label

[AvarianKnight]

Wouldn't this basically require you to add markdown in its entirety to the project? As people would just expect other mark down things to work too.

Seems like a lot of effort for a little ergonomics

[ivanzaida]

html links with <a href="https://example.com">Label</a> work, dont they?

[gottfriedleibniz]

Convention is that feature requests go to the forums.

The responses to this issue should be an indication to things however.