feat: add Galadriel API integration (#188)

* feat: add Galadriel API integration

* Fix toolCall for the Galadriel LLM provider

rig-core/examples/agent_with_galadriel.rs

@@ -0,0 +1,23 @@
+use rig::{completion::Prompt, providers};
+use std::env;
+
+#[tokio::main]
+async fn main() -> Result<(), anyhow::Error> {
+    // Create Galadriel client
+    let client = providers::galadriel::Client::new(
+        &env::var("GALADRIEL_API_KEY").expect("GALADRIEL_API_KEY not set"),
+        env::var("GALADRIEL_FINE_TUNE_API_KEY").ok().as_deref(),
+    );
+
+    // Create agent with a single context prompt
+    let comedian_agent = client
+        .agent("gpt-4o")
+        .preamble("You are a comedian here to entertain the user using humour and jokes.")
+        .build();
+
+    // Prompt the agent and print the response
+    let response = comedian_agent.prompt("Entertain me!").await?;
+    println!("{}", response);
+
+    Ok(())
+}