chore: Rename project.rb to workspace.rb and add backups method

Author: hahwul

lib/caido/helpers/project.rb renamed to lib/caido/helpers/workspace.rb

@@ -13,5 +13,20 @@ def projects
         }
       }')['projects']
     end
+
+    def backups
+      query('query{
+        backups{
+          id
+          name
+          status
+          updatedAt
+          createdAt
+          path
+          size
+          downloadUri
+        }
+      }')['backups']
+    end
   end
 end