Add support to mention users (Owners and Subscribers) in MS Teams based on Elementary alerts

[FrankTub]

Is your feature request related to a problem? Please describe.

It would be really cool if we could mention users in MS Teams messages that are sent.

Here an example of what the code would look like was found: https://github.com/rveachkc/pymsteams/pull/118/files.

Describe the solution you'd like

Being able to mention an user just like one could do in the Slack Integration.

Describe alternatives you've considered
N/A

Additional context

Probably best to pick this up only after #1404 is implemented.

Would you be willing to contribute this feature?

If #1404 is implemented I would like to be notified and could take a look if I can pick this up.

[FrankTub]

Given that #1404 is implemented. I would like to bring this issue under the attention that this would be really cool!

[mattia-m5t]

This would be really useful. In our team we have a person in charge of daily checking alerts, elementary dashboard then dispatching alerts to the right owner. The mention would be really time-saver and great feature!