Create a publisher to Cloudflare R2 Bucket

### Pre-flight checklist

- [x] I have read the [contribution documentation](https://github.com/electron/forge/blob/main/CONTRIBUTING.md) for this project.
- [x] I agree to follow the [code of conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project uses.
- [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem description

I am implementing auto updates in an Electron application with Forge, and I noticed that there is no implementation for Cloudflare R2. It has features very similar to AWS S3 Bucket, and I think it would be a great addition to the project.

### Proposed solution

Creation of a package called publisher-r2 with the respective integration

### Alternatives considered

Use the S3 or other publisher

### Additional information

_No response_