Add option to disable /syncing with custom puppets

mautrix_telegram/config.py

@@ -191,6 +191,7 @@ class Config(DictWithRecursion):
         copy("bridge.public_portals")
         copy("bridge.native_stickers")
         copy("bridge.catch_up")
+        copy("bridge.sync_with_custom_puppets")
 
         if "bridge.message_formats.m_text" in self:
             del self["bridge.message_formats"]

mautrix_telegram/puppet.py

@@ -107,7 +107,8 @@ class Puppet:
             if mxid != self.custom_mxid:
                 return 2
             return 1
-        asyncio.ensure_future(self.sync(), loop=self.loop)
+        if config["bridge.sync_with_custom_puppets"]:
+            asyncio.ensure_future(self.sync(), loop=self.loop)
         return 0
 
     def create_sync_filter(self) -> Awaitable[str]: