Notebook API Support (#12442)

Full feature support including:
* Notebook widget rendering
* Kernel selection
* Cell execution
* Custom output rendering
* Plugin host support

Signed-off-by: Jonah Iden <jonah.iden@typefox.io>
Co-authored-by: Mark Sujew <mark.sujew@typefox.io>

Author: jonah-iden

examples/browser/package.json

@@ -34,6 +34,7 @@
     "@theia/mini-browser": "1.40.0",
     "@theia/monaco": "1.40.0",
     "@theia/navigator": "1.40.0",
+    "@theia/notebook": "1.40.0",
     "@theia/outline-view": "1.40.0",
     "@theia/output": "1.40.0",
     "@theia/plugin-dev": "1.40.0",

examples/browser/tsconfig.json

@@ -65,6 +65,9 @@
     {
       "path": "../../packages/navigator"
     },
+    {
+      "path": "../../packages/notebook"
+    },
     {
       "path": "../../packages/outline-view"
     },