Create WhatsApp link if phone number exists

[pranavsb]

Launching a wa.me//[country_code+phone number] with a whatsapp icon button in the "social media line item" might be useful.

Note: this assumes that the user enters a Whatsapp phone number. We could also add a notice in the profile edit phone number field that this would also reflect as a whatsapp number.

Saving a number as WhatsApp or not and then deciding whether to show only the phone number or show both the phone number and a WhatsApp icon button would need backend changes