Implement __lt__() for BaseNode (#115)

(cherry picked from commit 61a56cd)

Author: floxay

elastic_transport/_node/_base.py

@@ -143,6 +143,11 @@ def path_prefix(self) -> str:
     def __repr__(self) -> str:
         return f"<{self.__class__.__name__}({self.base_url})>"
 
+    def __lt__(self, other: object) -> bool:
+        if not isinstance(other, BaseNode):
+            return NotImplemented
+        return id(self) < id(other)
+
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, BaseNode):
             return NotImplemented