feat(Actor): make panic on Err in fn tell configureable

[hnorkowski]

Closes #257

Adds a const boolean TELL_PANIC_ON_ERR to trait Actor which is set to true by default and when

• is true: does not change the current behavior
• is false: ignores when the answer to a tell(..) contains Err(..)

Because the bool is const it should not introduce any runtime overhead.

Writing Tests

I was unsure where it would be appropriate to place a test for that behavior. If you want me to add one please tell me where it should be placed and I will happily add one 😃

[tqwewe]

@hnorkowski I've made a commit adding the new PanicReason enum, which supports a bunch of reasons for a panic to have occurred.

I think this is a great addition, so thank you for opening the issue/pr! Does this enum solve your issue?

kameo/src/error.rs

Lines 634 to 663 in 2887710

	/// Describes the cause of an actor panic or fatal error.
	///
	/// In kameo, several error conditions are treated as panics, triggering the
	/// [`on_panic`](crate::actor::Actor::on_panic) lifecycle hook and potentially
	/// stopping the actor.
	#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
	pub enum PanicReason {
	/// A message handler panicked during execution.
	///
	/// This occurs when an actor's [`Message::handle`](crate::message::Message::handle)
	/// implementation panics or unwinds.
	HandlerPanic,
	/// The `on_message` hook returned an error.
	///
	/// In the default implementation, this occurs when a message handler returns
	/// an error during a [`tell`](crate::actor::ActorRef::tell) operation, where
	/// there's no mechanism to return the error to the caller. However, if
	/// [`Actor::on_message`] is overridden with
	/// custom logic, this variant indicates that the custom implementation
	/// returned an error.
	OnMessage,
	/// The [`on_start`](Actor::on_start) lifecycle hook returned an error.
	OnStart,
	/// The [`on_panic`](Actor::on_panic) lifecycle hook returned an error.
	OnPanic,
	/// The [`on_link_died`](Actor::on_link_died) lifecycle hook returned an error.
	OnLinkDied,
	/// The [`on_stop`](Actor::on_stop) lifecycle hook returned an error.
	OnStop,
	}

[hnorkowski]

Yes that looks great! Thanks for your kind replies and implementing it 😊 If I could I would approve it 😄