Separate component browser sections for every namespace libraries are imported from

[galin-enso]

Pull Request Description

This PR adds new sections to the component browser section navigator bar. The sections are based on the namespaces from which libraries are imported. Selecting a namespace section from the navigator bar highlights the modules from that namespace. Selecting a module from a different namespace switches the navigator bar indicator to the correct namespace category. The currently selected namespace is also shown as the root of the breadcrumbs.

unknown_2023.01.12-19.03.mp4

For a new project where only the Standard namespace exists the only visible change is the breadcrumbs. Adding for example additional modules in the project src folder will create them in the local namespace, this namespace will show up as a separate navigator section.

Important Notes

Checklist

Please include the following checklist in your PR:

• The documentation has been updated if necessary.
• All code conforms to the
  Scala,
  Java,
  and
  Rust
  style guides.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed: Enso GUI was tested when built using BOTH
    ./run ide build and ./run ide watch.

[wdanilo]

I just second Adam's comment. I browsed the code and didn't see anything else, so I'm approving.

[vitvakatu]

LGTM, QA passed