signInWithPopup() lacks API to pass size hints

### Operating System

Any

### Environment (if applicable)

Google Chrome 130.0.6723.58 (Official Build) (64-bit)

### Firebase SDK Version

10.12.0

### Firebase SDK Product(s)

Auth

### Project Tooling

Angular app.

### Detailed Problem Description

We use signInWithPopup() also with customOIDC providers. For some providers the popup cuts off the login button (at the button of the popup).
The window size is hardcoded to 500 x 600 in https://github.com/firebase/firebase-js-sdk/blob/b807119252dacf46b0122344c2b6dfc503cecde1/packages/auth/src/platform_browser/util/popup.ts#L36-L37

The parameters are not exposed publicly as it seems (please correct me if I am wrong).

In the past I could see the default for known providers in idp.js (see e.g. https://github.com/firebase/firebase-js-sdk/pull/2966/files).

The file was removed in a huge PR #5345, that is hard to read and reason to see where things went.

### Steps and code to reproduce issue

See problem desc