Link previews and shared URLs doesn't contain data for self contact link

[igor-sirotin]

Problem

When calling a ShareUserURLWithData or StatusUnfurler.buildContactData with self public key, the result won't contain any data like DisplayName, Description, thumbnail.

Implementation

In both cases:

• status-go/protocol/messenger_share_urls.go

  Line 500 in 157e2de

  contact, ok := m.allContacts.Load(contactID)

• status-go/protocol/linkpreview_unfurler_status.go

  Line 54 in 157e2de

  contact := u.m.GetContactByID(contactID)

... the contact is requested with messenger.allContacts.Load, which has custom handling for self-requests:

status-go/protocol/messenger_maps.go

Lines 63 to 73 in 244b427

	func (cm *contactMap) Load(contactID string) (*Contact, bool) {
	if contactID == cm.me.ID {
	cm.logger.Warn("contacts map: loading own identity", zap.String("contactID", contactID))
	return cm.me, true
	}
	contact, ok := cm.sm.Load(contactID)
	if contact == nil {
	return nil, ok
	}
	return contact.(*Contact), ok
	}

The problem is that contactMap.me is created with no properties and is never updated.

I think there might be more affected places.

Notes

The thing is that yourself is not a contact. The original change (#3627) for ContactsMap still makes sense. We should avoid storing ourselves as a contact.

There're 2 ways out of this:

1. Keep ContactsMap as is and update messenger.GetContactByID so that it checks if self-request if made, build and return a valid contact from there.
2. Keep ContactsMap up-to-date. This will require updating it on each change like SetDisplayName, SetBio, etc.

I tend to go with option 1.

[igor-sirotin]

Related: #3719