feat: Store chat history

[ushinnary]

Adding feature to store chat history on lib's side. User send only one message and lib pre-fill all history with stored messages.

Example usage (discord bot) :

lazy_static! {
    static ref OLLAMA: Mutex<Ollama> = Mutex::new(Ollama::new_default_with_history(30));
}

// ...
let mut ollama = OLLAMA.lock().await;

ollama.send_chat_messages_with_history(
            ChatMessageRequest::new(
                env::var("OLLAMA_MODEL").unwrap_or("llama2".to_string()),
                vec![ChatMessage::user(message)],
            ),
            user_id, // Or any id you provide for history_id
        )
        .await

Hope you find this feature useful. Open for improvements, thanks.

[pepperoni21]

Hey, that's an interesting feature, I will review the code in details later in the day. Some of the imports are unused when the feature is not enabled, can you make them optional in order for the check to suceed?

[ushinnary]

Yep, once im home i'll fix it

[ushinnary]

I've just pushed a commit that removes an unused import I previously overlooked. My apologies for any inconvenience this might have caused.

[pepperoni21]

Great, can you just provide an example script inside the examples folder?

[ushinnary]

@pepperoni21 yep, here it is. Tell me if I need to provide anything else. You can also contact me on discord, I have the same username there :)