Handle Multiple Trailing Controls in `CupertinoAppBar`

[ndonkoHenri]

Summary by Sourcery

This pull request enhances the CupertinoAppBar to support multiple trailing controls by wrapping them in a Row widget. Additionally, it updates the bug report issue template to provide clearer instructions and additional resources for users reporting issues.

• Enhancements:
  • Enhanced CupertinoAppBar to handle multiple trailing controls by wrapping them in a Row widget.
• Chores:
  • Updated the bug report issue template to include more detailed instructions for providing code samples, logs, and media, and added links to documentation and support resources.