a2uiMessageProcessor not have getTools method

[cjl84914]

genui version: 0.6.1

[ditman]

This seems to be referenced in genui/README.md:

genui/packages/genui/README.md

Lines 387 to 402 in 008f4a5

	#### Update the system instruction to use the new widget
	In order to make sure the agent knows to use your new widget, use the system
	instruction to explicitly tell it how and when to do so. Provide the name from
	the CatalogItem when you do.
	```dart
	final contentGenerator = FirebaseAiContentGenerator(
	systemInstruction: '''
	You are an expert in creating funny riddles. Every time I give you a word,
	you should generate a RiddleCard that displays one new riddle related to that word.
	Each riddle should have both a question and an answer.
	''',
	tools: _a2uiMessageProcessor.getTools(),
	);
	```