agent2: Add now, grep, and web search tools (#35974)

Release Notes:

- N/A

---------

Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
Co-authored-by: Antonio Scandurra <me@as-cii.com>

crates/cloud_llm_client/src/cloud_llm_client.rs

@@ -263,12 +263,12 @@ pub struct WebSearchBody {
     pub query: String,
 }
 
-#[derive(Serialize, Deserialize, Clone)]
+#[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct WebSearchResponse {
     pub results: Vec<WebSearchResult>,
 }
 
-#[derive(Serialize, Deserialize, Clone)]
+#[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct WebSearchResult {
     pub title: String,
     pub url: String,