Authentication integration test

- add end-to-end test AuthenticationEndpoint
- add user-token.data
- add admin-token.data
- add .data to .editorconfig

.editorconfig

@@ -17,6 +17,10 @@ tab_width = 2
 [*.bat]
 end_of_line = crlf
 
+[*.data]
+max_line_length = 1024
+insert_final_newline = false
+
 [*.pem]
 max_line_length = 64
 insert_final_newline = false