Add a setting that enables serving memory from GitHub Copilot Memory.

I use GitHub Copilot to create memories that I don’t want to lose if my system is reset. In VS Code, these memories are currently stored locally at:

```text
C:\Users\{{myname}}\AppData\Roaming\Code\User\globalStorage\github.copilot-chat\memory-tool\memories
```

I would like a feature that allows these memories to be stored in or synchronized with OneDrive or Google Drive. I have invested significant time and tokens in building them, and I use them globally rather than within a specific workspace.

When needed, I use `@memory` to provide context, and it works well. It helps Copilot remember what I have worked on previously instead of starting from scratch.

Could settings be introduced to let users choose a custom storage location or synchronize memories with a cloud storage service? One of the benefits for me is using a memory file to track and learn from my progress. Is there a way to support this requirement?