adopt updated interface

Author: fumito-ito

Sources/FunctionCalling-FirebaseVertexAI/FunctionCalling_FirebaseVertexAI.swift

@@ -9,16 +9,14 @@ import FunctionCalling
 import FirebaseVertexAI
 import Foundation
 
-typealias FunctionCallingTool = FunctionCalling.Tool
-
 extension ToolContainer {
     public var firebaseVertexAITools: [FirebaseVertexAI.Tool] {
-        get throws {
-            let data = allTools.data(using: .utf8)!
-            let functionCallingTools = try JSONDecoder().decode([FunctionCallingTool].self, from: data)
-            let firebaseVertexAITools = functionCallingTools.map { $0.toFunctionDeclaration }
-
-            return [FirebaseVertexAI.Tool(functionDeclarations: firebaseVertexAITools)]
+        get {
+            [
+                FirebaseVertexAI.Tool(
+                    functionDeclarations: allTools?.compactMap { $0.toFunctionDeclaration }
+                )
+            ]
         }
     }
 }