Support MCP resources and prompts.

### Describe the feature or problem you'd like to solve

MCP servers provide three distinct features: tools, prompts, and resources. Currently, Copilot only supports tools. In addition, please support resources and prompts.

### Proposed solution

Tools can provide a description and a schema for the request. However, often times more complex documentation may be needed and [resources](https://modelcontextprotocol.io/specification/2025-11-25/server/resources) can fill that gap. [Prompts](https://modelcontextprotocol.io/specification/2025-11-25/server/prompts) would also be useful to provide pre-defined prompt templates to users.

### Example prompts or workflows

_No response_

### Additional context

_No response_