[UI] Import context (#11685)

* Refactor ImporterDrawer

- Use a single, globally accessible object
- Provide global state management

* Expose global importer state to the plugin interface

* Improve registration of data import serializers

* Update frontend version / docs

* Bump API version

src/frontend/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@inventreedb/ui",
     "description": "UI components for the InvenTree project",
-    "version": "0.9.0",
+    "version": "0.10.0",
     "private": false,
     "type": "module",
     "license": "MIT",