Add tool calling support for Gemini models (#27772)

Release Notes:

- N/A

crates/assistant_tool/src/assistant_tool.rs

@@ -11,6 +11,7 @@ use anyhow::Result;
 use gpui::{App, Entity, SharedString, Task};
 use icons::IconName;
 use language_model::LanguageModelRequestMessage;
+use language_model::LanguageModelToolSchemaFormat;
 use project::Project;
 
 pub use crate::action_log::*;
@@ -50,7 +51,7 @@ pub trait Tool: 'static + Send + Sync {
     fn needs_confirmation(&self) -> bool;
 
     /// Returns the JSON schema that describes the tool's input.
-    fn input_schema(&self) -> serde_json::Value {
+    fn input_schema(&self, _: LanguageModelToolSchemaFormat) -> serde_json::Value {
         serde_json::Value::Object(serde_json::Map::default())
     }