bug(mac): package info should scroll into view when package is expanded

### Describe the bug

In the Keyman Configuration app, when a disclosure arrow (or the title of the package) is clicked, and the disclosure group expands to reveal the package information, the disclosure group should scroll into view. Otherwise, it may not be evident that the disclosure group opened at all.

### Keyman apps

- [ ] Keyman for Android
- [ ] Keyman for iPhone and iPad
- [ ] Keyman for Linux
- [x] Keyman for macOS
- [ ] Keyman for Windows
- [ ] Keyman Developer
- [ ] KeymanWeb
- [ ] Other - give details at bottom of form

### Keyman version

alpha 19