feat: add refresh_oauth_tokens() API (#92)

* refresh_oauth_token , include returned refresh_token

The refresh_token can be used only once 
Users will need the new refresh_token, which is included in the API response, in order to call the refresh_oauth_token again if needed.

* Update main.py

* refresh_oauth_tokens , include returned json Token item

The default `refresh_oauth_token` function returns only access_token.

If user requires a new refresh_token too, they can use this new function that returns the complete refreshed Token that includes both the access_token and the new refresh_token

* refresh_oauth_tokens , include returned json Token item

* refresh_oauth_tokens, black formatter

---------

Co-authored-by: simcha-gs <[email protected]>

Author: simchaSure

src/casdoor/main.py

@@ -233,6 +233,19 @@ def refresh_oauth_token(self, refresh_token: str, scope: str = "") -> str:
 
         return access_token
 
+    def refresh_oauth_tokens(self, refresh_token: str, scope: str = "") -> Dict:
+        """
+        Request the Casdoor server to get a refreshed Token.
+
+        :param refresh_token: refresh_token for send to Casdoor
+        :param scope: OAuth scope
+        :return: Response from Casdoor
+        """
+        r = self.refresh_token_request(refresh_token, scope)
+        refreshed_token = r.json()
+
+        return refreshed_token
+
     def parse_jwt_token(self, token: str, **kwargs) -> Dict:
         """
         Converts the returned access_token to real data using