MSI: Add a UI dialog with additional installation options

[lrandersson]

Checklist

• I added a descriptive title
• I searched open requests and couldn't find a duplicate

What is the idea?

Based on the work in #1084, when you build an MSI installer you cannot prompt the user to choose specific installation options. For comparison the exe installers have this behavior already via OptionsDialog.nsh, where they can choose several optional features for their installation.

Why is this needed?

To enable the user to customize their installation with additional features/behaviors. For example, when a user runs my installer I want to allow the user to decide if a specific environment variable should be added to PATH or not. This is also already available via the exe installers.

What should happen?

A UI dialog similar to the current behavior with exe installers should be displayed where the user can customize their installation.

Additional Context

No response

[mhsmith]

Briefcase's installer options are documented here. Adding at least one option to the pyproject.toml file should cause the options dialog to appear.