Add napari-base output and reorganize dependencies (#63)

I've added a new output, `napari-base`, following conversation in this PR, this [Zulip thread](https://napari.zulipchat.com/#narrow/stream/212875-general/topic/.E2.9C.94.20The.20plugin.20.22install.2Funinstall.22.20button.20not.20shown.20in.20.22Plu.2E.2E.2E), and [this other one](https://napari.zulipchat.com/#narrow/stream/212875-general/topic/napari.20plugin.20manager.20in.20conda.20recipe).

With this PR we will have these outputs:

* `napari-base`: the core library, with only the required dependencies. Use it for your Pyhton imports but no GUI action.
* `napari`: the application sans the Qt backend. It contains optional yet recommended dependencies for (performant) GUI usage, like the plugin manager or `numba`. 
* `napari-menu`: just the `menuinst` JSON file, in case you want a desktop shortcut.

Most end-users will want to `conda install napari pyqt` or `conda install napari pyside2`.

---------

Co-authored-by: jaimergp <jaimergp@users.noreply.github.com>
Co-authored-by: conda-forge-webservices[bot] <91080706+conda-forge-webservices[bot]@users.noreply.github.com>

recipe/meta.yaml

@@ -12,10 +12,10 @@ source:
     sha256: 3920b144d72e8af8fe0da3da679b2d39aa2d097c10a2c75a3b4e42ffcef17cac
 
 build:
-  number: 1
+  number: 2
 
 outputs:
-  - name: napari
+  - name: napari-base
     version: {{ version }}
     build:
       noarch: python
@@ -49,7 +49,6 @@ outputs:
         - magicgui >=0.7.0
         - napari-console >=0.0.9
         - napari-plugin-engine >=0.1.9
-        - napari-svg >=0.1.8
         - npe2 >=0.7.6
         - numpy >=1.22.2
         - numpydoc >=0.9.2
@@ -73,19 +72,10 @@ outputs:
         - vispy >=0.14.1,<0.15.0a0
         - wrapt >=1.11.1
 
-        # additional dependencies for convenience in conda-forge
-        - fsspec
-        - pooch >=1.3.0
-        - zarr >=2.12.0
-
       run_constrained:
-        - napari-plugin-manager >=0.1.0a2,<0.3.0a0
         - pyside2 >=5.13.2,!=5.15.0
         - pyside6 <6.5|>=6.7
         - pyqt >=5.12.3,!=5.15.0,<6.0a0|>=6.5,!=6.6.1
-        # Nice for performance, but optional. Inclusion under discussion.
-        # - py-triangle
-        # - numba >=0.57.1  # https://github.com/napari/napari/pull/6467#issuecomment-1819038165
 
     test:
       requires:
@@ -115,6 +105,33 @@ outputs:
         - LICENSE
         - napari/_vendor/darkdetect/LICENSE
         - napari/_vendor/qt_json_builder/LICENSE
+      summary: a fast n-dimensional image viewer in Python, with only the required dependencies
+      doc_url: http://napari.org
+      dev_url: https://github.com/napari/napari
+
+  - name: napari
+    version: {{ version }}
+    build:
+      noarch: python
+    requirements:
+      run:
+        - {{ pin_subpackage('napari-base', exact=True) }}
+        - fsspec
+        - napari-plugin-manager >=0.1.0a2,<0.3.0a0
+        - napari-svg >=0.1.8
+        - numba >=0.57.1
+        - pooch >=1.3.0
+        # - py-triangle  # can segfault with bad data: https://github.com/napari/napari/pull/6654
+        - zarr >=2.12.0
+    test:  # just to check that the environment can indeed solve
+      requires:
+        - pyside2  # use this opportunity to test solvability with other backend
+      imports:
+        - napari
+    about:
+      home: http://napari.org
+      license: BSD-3-Clause AND MIT
+      license_file: LICENSE
       summary: a fast n-dimensional image viewer in Python
       description: a fast n-dimensional image viewer in Python
       doc_url: http://napari.org