[EPIC] - Support latest Google Unifed SDK to access Google AI Models

[markpollack]

This is a placeholder EPIC issue to support https://cloud.google.com/vertex-ai/generative-ai/docs/sdks/overview

All previous threads/issues of discussion should be consolidated into this issue.

[markpollack]

@ddobrin can you update the epic please with your initial thoughts please.

[ddobrin]

Let's start by mentioning the documentation to be used to track this effort

1. Javadoc for the Google Gen AI Java SDK - up-to-date with every release here

2. Examples implementing each major features up-to-date here

3. Models and Model Capabilities documented here