GH-5229: Support Gemini Computer use

[yasu89]

Prerequisite: the bug fix in #5007 is required.

This PR adds support for Gemini’s Computer Use feature. Close #5229
https://ai.google.dev/gemini-api/docs/computer-use

• Adds options related to Computer Use.
• In Computer Use, FunctionResponse parts must include a screenshot and the current URL.
  • To support this, we introduce the ToolCallResult class so tool call results can store new metadata in ToolResponse.
  • Using that metadata, we append the screenshot and URL to FunctionResponse parts.

If there’s a better approach for implementing FunctionResponse parts, I’m happy to adjust.

[ilayaperumalg]

@ddobrin Could you help with the review of this PR? Thanks!

[yasu89]

I’ve created a demo implementation using this PR to demonstrate the Computer Use feature:
https://github.com/yasu89/spring-ai-computer-use-demo