allow to send message with JustText quote in MessageData

[adbenitez]

in the json-rpc you can send a message with send_msg which accepts a MessageData object, that object has a quoted_message_id property, this allows to set a message as quote, but with bridge bots like matterdelta it is needed to set a quoted text without a corresponding message, this is would make things easier to bridge messages from other platforms to delta chat or even bridged Delta Chat groups but in different accounts where you can not set as quote of a message of account A the message id of a message from account B