Add models api

examples/model.rs

@@ -0,0 +1,23 @@
+use openai_api_rs::v1::api::OpenAIClient;
+use std::env;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let api_key = env::var("OPENAI_API_KEY").unwrap().to_string();
+    let mut client = OpenAIClient::builder().with_api_key(api_key).build()?;
+
+    let result = client.list_models().await?;
+    let models = result.data;
+
+    for model in models {
+        println!("Model id: {:?}", model.id);
+    }
+
+    let result = client.retrieve_model("gpt-4.1".to_string()).await?;
+    println!("Model id: {:?}", result.id);
+    println!("Model object: {:?}", result.object);
+
+    Ok(())
+}
+
+// OPENAI_API_KEY=xxxx cargo run --package openai-api-rs --example model