[Feature Request]: Update helper code for single class or namespace

[mortenscheel]

Feature Description

I work on huge project, where "Generate helper code" takes ~30 seconds (~5MB) on a fast machine. It's worth the wait, considering how much the generated code improves the development experience. But it would be even better if it was possible to only update the helper code for a small part of the project, like perhaps

• The currently active file
• The currently selected namespace (as an intention)
• The currently selected file/folder in the IDE.

[adelf]

It's really challenging. We will try to find some solution.