Enable the cancellation of the effect

[DevYeom]

Related Issues 💭

Description 📝

• Added methods to AnyEffect to cancel effects.
• Updated the documentation.

Additional Notes 📚

func reduce(state: inout State, action: Action) -> AnyEffect<Action> {
    switch action {
// ...
    case .request:
        return .single {
            let result = await api.result()
            return Action.response(result)
        }
        .cancellable("requestID")

    case .cancel:
        return .cancel("requestID")
// ...
    }
}

enum EffectID {
    case request
}

func reduce(state: inout State, action: Action) -> AnyEffect<Action> {
    switch action {
// ...
    case .request:
        return .single {
            let result = await api.result()
            return Action.response(result)
        }
        .cancellable(EffectID.request)

    case .cancel:
        return .cancel(EffectID.request)
// ...
    }
}

Checklist ✅

• [x] If it's a new feature, have appropriate unit tests been added?
• [x] If the changes affect existing functionality, please verify whether the above information has been appropriately described.