Add store and metadata parameters (64bit#300)

* Add store flag for chat completion request

* Add metadata and example used in evals and distillation guides

Author: didriksg

examples/chat-store/Cargo.toml

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+[package]
+name = "chat-store"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+async-openai = {path = "../../async-openai"}
+serde_json = "1.0.117"
+tokio = { version = "1.38.0", features = ["full"] }

examples/chat-store/README.md

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+### Output
+
+> Response:
+>
+> 0: Role: assistant  Content: To hide the dock on a Mac, you can follow these steps:\n\n1. Click on the Apple logo in the top-left corner of the screen.\n2. Select \"System Preferences\" from the drop-down menu.\n3. Click on \"Dock & Menu Bar\".\n4. Under the \"Dock\" section, you will see an option to \"Automatically hide and show the Dock\". Check the box next to this option.\n5. The dock will now be hidden until you move your cursor to the bottom of the screen, at which point it will slide back into view.\n\nYou can also change the size and position of the dock in the Dock preferences

examples/chat-store/src/main.rs

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+use std::error::Error;
+use async_openai::{
+    types::{
+        ChatCompletionRequestAssistantMessageArgs, ChatCompletionRequestSystemMessageArgs,
+        ChatCompletionRequestUserMessageArgs, CreateChatCompletionRequestArgs,
+    },
+    Client,
+};
+use serde_json::json;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    let client = Client::new();
+
+    let request = CreateChatCompletionRequestArgs::default()
+        .max_tokens(512u32)
+        .model("gpt-3.5-turbo")
+        .store(true)
+        .metadata(json!({
+            "role": "manager",
+            "department": "accounting",
+            "source": "homepage",
+        }))
+        .messages([
+            ChatCompletionRequestSystemMessageArgs::default()
+                .content("You are a corporate IT support expert.")
+                .build()?
+                .into(),
+            ChatCompletionRequestUserMessageArgs::default()
+                .content("How can I hide the dock on my Mac?")
+                .build()?
+                .into(),
+        ])
+        .build()?;
+
+    println!("{}", serde_json::to_string(&request).unwrap());
+
+    let response = client.chat().create(request).await?;
+
+    println!("\nResponse:\n");
+    for choice in response.choices {
+        println!(
+            "{}: Role: {}  Content: {:?}",
+            choice.index, choice.message.role, choice.message.content
+        );
+    }
+
+    Ok(())
+}