Open chat/call via "system" contacts app

### Your use case

#### What would you like to do?
Be able to chat/call with others via the contacts app.

#### Why would you like to do it?
some people actually like using that 😉

#### How would you like to achieve it?
Add a section for chatting and calling in the contacts app just like WhatsApp/Telegram/Signal and other messenger apps.

A few ways I've considered doing this:
Have the app open in the search view searching for the contact name.
Have the app open and search for email.
Have the app open and do a look up to the identity server to find the mxid and go to that room or create one with that mxid.

I will take a look at programming the part which doesn't involve these options, since I'll be focused on starting a call with the number via the dial pad but hopefully this code could then be reused for this use case.

### Have you considered any alternatives?

No it's a pretty basic feature

### Additional context

_No response_