Consistent packaging of napari backends in optional dependencies

[alessandrofelder]

Across all packages, I would suggest we should:

• always NOT ship any qt backend in [napari] optional dependencies to follow napari plugin best practice.
• always ship napari[pyqt5] or whatever the napari default backend is, in the [dev] optional dependencies

[alessandrofelder]

We should also document this as part of brainglobe/brainglobe.github.io#8

[adamltyson]

We need to ship napari in some way though right? Otherwise it complicates install for the user. What about:

• Don't ship in the plugins themselves
• Ship default backend in the metapackage

[alessandrofelder]

What about:
...

Happy with that. The drawback of this suggestion is if people install with pyside2 for some license-related reason, installing the metapackage will be complicated?

[adamltyson]

Happy with that. The drawback of this suggestion is if people install with pyside2 for some license-related reason, installing the metapackage will be complicated?

I guess the fallback here will just be to install the packages individually