Codelist integration

* adds codelist app
* adds KonovaCodeList and KonovaCode model for fetching and storing OSIRIS Codelisten entries
* adds update_codelist command for updating and fetching codes
* adds autocomplete route for using codelists in forms

codelist/admin.py

@@ -0,0 +1,36 @@
+from django.contrib import admin
+
+from codelist.models import KonovaCode, KonovaCodeList
+
+
+class KonovaCodeListAdmin(admin.ModelAdmin):
+    list_display = [
+        "id",
+    ]
+    readonly_fields = [
+        "id",
+        "codes",
+    ]
+
+
+class KonovaCodeAdmin(admin.ModelAdmin):
+    list_display = [
+        "id",
+        "parent",
+        "short_name",
+        "long_name",
+        "is_leaf",
+        "is_active",
+    ]
+
+    readonly_fields = [
+        "id",
+        "short_name",
+        "long_name",
+        "is_leaf",
+        "parent",
+    ]
+
+
+#admin.site.register(KonovaCodeList, KonovaCodeListAdmin)
+admin.site.register(KonovaCode, KonovaCodeAdmin)