Support {self: this} for fnUntraced

What is the problem this feature would solve?

• using Effect.fnUntraced() to define class methods (when tracing is not needed)

• consistency with Effect.fn() API (I ran into this when I realized I didn't need Effect.fn() and refactored some usages to Effect.fnUntraced())

What is the feature you are proposing to solve the problem?

Effect.fnUntraced() should accept a { self: this } overload the same way that Effect.fn() does

What alternatives have you considered?

No response