Add type annotations for oracle.

Author: tillahoffmann

oracle/testcontainers/oracle/__init__.py

@@ -17,17 +17,17 @@ class OracleDbContainer(DbContainer):
         ...     result = e.execute("select * from V$VERSION")
     """
 
-    def __init__(self, image="wnameless/oracle-xe-11g-r2:latest", **kwargs):
+    def __init__(self, image: str = "wnameless/oracle-xe-11g-r2:latest", **kwargs) -> None:
         super(OracleDbContainer, self).__init__(image=image, **kwargs)
         self.container_port = 1521
         self.with_exposed_ports(self.container_port)
         self.with_env("ORACLE_ALLOW_REMOTE", "true")
 
-    def get_connection_url(self):
+    def get_connection_url(self) -> str:
         return super()._create_connection_url(
             dialect="oracle", username="system", password="oracle", port=self.container_port,
             db_name="xe"
         )
 
-    def _configure(self):
+    def _configure(self) -> None:
         pass