Add message.link attribute/property (#442)

* Add message.link attribute

Adds the functionality to access the message link.
Either as `t.me/c/` or `t.me/username` format.

* Change message.link logic

Property now has a returned type, list is a tuple and
we use `utils.get_channel_id` to not rely on str.replace

* Update message.py

- Prepend https:// like official clients do
- Use .format()

Co-authored-by: Dan <14043624+delivrance@users.noreply.github.com>

pyrogram/client/types/messages_and_media/message.py

@@ -251,6 +251,9 @@ class Message(Object, Update):
             Messages sent from yourself to other chats are outgoing (*outgoing* is True).
             An exception is made for your own personal chat; messages sent there will be incoming.
 
+        link (``str``):
+            A link to the message, only for groups and channels.
+
         matches (List of regex Matches, *optional*):
             A list containing all `Match Objects <https://docs.python.org/3/library/re.html#match-objects>`_ that match
             the text of this message. Only applicable when using :obj:`Filters.regex <pyrogram.Filters.regex>`.
@@ -670,6 +673,13 @@ class Message(Object, Update):
 
             return parsed_message
 
+    @property
+    def link(self) -> str:
+        if self.chat.type in ("group", "supergroup", "channel") and self.chat.username:
+            return "https://t.me/{}/{}".format(self.chat.username, self.message_id)
+        else:
+            return "https://t.me/c/{}/{}".format(utils.get_channel_id(self.chat.id), self.message_id)
+
     def reply_text(
         self,
         text: str,