Add MCP (Model Context Protocol) support for Griptape Agents and Assistants

[SavagePencil]

This is a powerful set of capabilities https://modelcontextprotocol.io/introduction

It instantly makes many other services available to an agent.

[collindutter]

Closing to keep discussion in one place: https://github.com/orgs/griptape-ai/discussions/1517. Upvoting that discussion helps it bubble to the top.