Page Number in Forms

**Is your feature request related to a problem? Please describe.**
I was using this library in my project but I just found out that it is impossible to retrieve the current form page

**Describe the solution you'd like**
I would like something to retrieve the current page number

The issue does not name a file, test, or form entry point. Start by locating the form implementation and checking how page state is represented; clarify the intended public API and expected page numbering before making changes. Done should include a documented way to retrieve the current form page and tests covering it.

Written by the indexing model from the issue text.