Griptape Tool Wrapper

** Please make sure you read the contribution guide and file the issues in the right place. **
[Contribution guide.](https://google.github.io/adk-docs/contributing-guide/)

**Is your feature request related to a problem? Please describe.**
I would like to use the Google ADK with my existing [Griptape Tools](https://docs.griptape.ai/stable/griptape-framework/tools/).

**Describe the solution you'd like**
I would like to see a wrapper class that can convert any Griptape BaseTool into a compatible ADK FunctionTool.

**Describe alternatives you've considered**
I haven't considered alternatives, since this pattern seems to follow existing conventions for integrations in the repo.

**Additional context**