Add ActiveSupport::Rescuable::ClassMethods

This annotation binds the block param of `rescue_from`
to `T.attached_class` so that sorbet can correctly identify that the scope
is the instance of the controller.

rbi/annotations/activesupport.rbi

@@ -505,3 +505,17 @@ class ActiveSupport::ErrorReporter
   end
   def unexpected(error, severity: T.unsafe(nil), context: T.unsafe(nil), source: T.unsafe(nil)); end
 end
+
+module ActiveSupport::Rescuable::ClassMethods
+  has_attached_class!
+
+  sig { 
+    params(
+      klasses: T.any(Module, String),
+      with: T.nilable(Symbol),
+      block: T.nilable(T.proc.params(exception: Exception).bind(T.attached_class).void)
+    )
+      .void
+  }
+  def rescue_from(*klasses, with:, &block); end
+end