Remove UserInputRequests methods

[qmuntal]

It doesn't add any value, as demonstrated by the examples changes in this PR. .NET just remove it in microsoft/agent-framework#3682.

[Copilot]

Pull request overview

This PR removes the UserInputRequests() methods from the Message, Response, ResponseUpdate, and Contents types, replacing them with a more generic Contents() method on the Response type. The motivation is to simplify the API, as demonstrated by the updated examples and alignment with the .NET implementation.

Changes:

• Removed filtering helper methods (UserInputRequests()) that only returned FunctionApprovalRequestContent items
• Added a generic Contents() method on Response that returns all content types
• Updated example code to iterate over all contents and filter for the desired type

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
message/content.go	Removed UserInputRequests() method from Contents type and unused iter import
message/message.go	Removed UserInputRequests() from Message and ResponseUpdate; added generic Contents() method to Response
examples/getting_started/azure_openai/step04_using_function_tools_with_approvals/main.go	Updated to use Contents() instead of UserInputRequests()
examples/getting_started/agent/step04_using_function_tools_with_approvals/main.go	Updated to use Contents() instead of UserInputRequests()

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