Add authentication classes, move auth logic there (#2528)

This adds argument `auth` and deprecates `login_or_token`, `password`, `jwt`, and `app_auth` arguments of `github.Github`.

This adds argument `auth` and deprecates `integration_id`, `private_key` of `github.GithubIntegration`.

This deprecates the `create_jwt` method of `github.GithubIntegration`, replaced by `github.Auth.AppAuth.create_jwt`.

github/AppAuthentication.py

@@ -23,13 +23,13 @@
 
 from typing import Dict, Optional, Union
 
+import deprecated
 
-class AppAuthentication:
-    app_id: Union[int, str]
-    private_key: str
-    installation_id: int
-    token_permissions: Optional[Dict[str, str]]
+from github.Auth import AppAuth, AppInstallationAuth
 
+
+@deprecated.deprecated("Use app.Auth.AppInstallationAuth instead")
+class AppAuthentication(AppInstallationAuth):
     def __init__(
         self,
         app_id: Union[int, str],
@@ -37,13 +37,8 @@ class AppAuthentication:
         installation_id: int,
         token_permissions: Optional[Dict[str, str]] = None,
     ):
-        assert isinstance(app_id, (int, str)), app_id
-        assert isinstance(private_key, str)
-        assert isinstance(installation_id, int), installation_id
-        assert token_permissions is None or isinstance(
-            token_permissions, dict
-        ), token_permissions
-        self.app_id = app_id
-        self.private_key = private_key
-        self.installation_id = installation_id
-        self.token_permissions = token_permissions
+        super().__init__(
+            app_auth=AppAuth(app_id, private_key),
+            installation_id=installation_id,
+            token_permissions=token_permissions,
+        )