This commit extends the profile popup to align more with the application
designs. There's still work left to be done such as showing/hiding the
qrcode view or copying data to the clipboard.
The profilepopup also relies on context data at the moment and should rather
receive its data via the newly introduced `getContractByID()` API proposed in
https://github.com/status-im/status-go/pull/1987
Similar to its `footer` content, ModalPopup can now receive header components
allowing consumers to design the header part of the modal to their likings.
Usage:
```
ModalPopup {
id: popup
header: Item {
...
}
...
}
```
The header section will take the height of the root element of the substree
passed to `header`