Add option to set private chat portal rooms' name/avatar explicitly

example-config.yaml

@@ -91,6 +91,16 @@ bridge:
     # are not normally sent to appservices.
     sync_with_custom_puppets: true
 
+    # Whether or not to invite own WhatsApp user's Matrix puppet into private
+    # chat portals when backfilling if needed.
+    # This always uses the default puppet instead of custom puppets due to
+    # rate limits and timestamp massaging.
+    invite_own_puppet_for_backfilling: true
+    # Whether or not to explicitly set the avatar and room name for private
+    # chat portal rooms. This can be useful if the previous field works fine,
+    # but causes room avatar/name bugs.
+    private_chat_portal_meta: false
+
     # The prefix for commands. Only required in non-management rooms.
     command_prefix: "!wa"