Message Archive Management handling remote messages by inferring direction instead. Adds MAM 2 support.

[Teglgaard]

We are using MAM 2 but would not be able to process the messages since all incoming messages are tagged with isOutgoing = false even though the message originally came from ourself.
To solve that issue we instead infer the direction.

public var mam = XMPPMessageArchiveManagement()

        let jid = _SOME JID_
  
        var fields: [DDXMLElement]? = nil
        let resultSet = XMPPResultSet(max: 100)
        mam.retrieveMessageArchive(withFields: fields, with: resultSet)

By using above we then process the necessary answer below:

public func xmppStream(_ sender: XMPPStream, willReceive message: XMPPMessage) -> XMPPMessage? {
        // Check if the message has a MAM result
        if let xmppMessage = message.mamResult?.forwardedMessage {
           
            return xmppMessage
        }
        
        // If not a MAM message or some other error, just return the original message
        return message
    }

By doing above combined with the code allows the messages to be stored correctly.

We discussed a couple of developers if they could find use cases for setting the direction manually and we could not.