[Feature Request]: setPermissionRequestHandler should pass the requesting frame in the details

### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

[session.setPermissionRequestHandler](https://www.electronjs.org/docs/api/session#sessetpermissionrequesthandlerhandler) provides a `webContents` and `isMainFrame`, but there is no way to know which specific frame the permission request came from.

### Proposed Solution

Provide a reference to the specific frame which originated the request, as a `WebFrameMain` in the `details` structure.

### Alternatives Considered

I think if we were designing this API today we'd pass a `WebFrameMain` as the first arg instead of a `WebContents`, but for back compat let's add the frame to the details.

### Additional Information

NA