feat: add ExpiryIndicatorClassic functionality with configuration and rendering

- Implemented ExpiryIndicatorClassic.js for managing expiry dates in SharePoint lists.
- Created classic-elements.xml to define the module for ExpiryIndicator assets.
- Added upgrade-actions-v2.xml to apply the new element manifests.
- Introduced ExpiryModels.test.ts for unit testing the expiry configuration and rules validation.

config/package-solution.json

@@ -3,7 +3,7 @@
   "solution": {
     "name": "expiry-indicator-client-side-solution",
     "id": "68bb6d2d-9895-45b4-88e8-b98835faa981",
-    "version": "1.0.11.0",
+    "version": "2.0.0.0",
     "includeClientSideAssets": true,
     "skipFeatureDeployment": false,
     "features": [
@@ -11,10 +11,17 @@
         "title": "ExpiryIndicator extension registration",
         "description": "Registers ExpiryIndicator commands and its settings Application Customizer. Does not provision ExpiryDate.",
         "id": "913402af-ab9a-4974-9f86-5c2159ae41db",
-        "version": "1.0.11.0",
+        "version": "2.0.0.0",
         "assets": {
           "elementManifests": [
-            "elements.xml"
+            "elements.xml",
+            "classic-elements.xml"
+          ],
+          "elementFiles": [
+            "ExpiryIndicatorClassic.js"
+          ],
+          "upgradeActions": [
+            "upgrade-actions-v2.xml"
           ]
         }
       }