Add Recurring Events Web Part with data service and UI components

- Implement RecurringEventsDataService for fetching events from SharePoint lists.
- Define types for events and categories in RecurringEventsTypes.
- Create RecurringEventsWebPart to manage properties and render events.
- Develop UI components for displaying events in filmstrip and compact layouts.
- Add localization support for English and German languages.
- Implement tests for core functionalities related to event handling.
- Set up TypeScript and TSLint configurations for the project.

tests/tsconfig.json

@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "outDir": "../temp/tests",
+    "rootDir": "..",
+    "lib": ["es5", "dom", "es2015.promise"],
+    "types": [],
+    "skipLibCheck": true
+  },
+  "files": [
+    "../src/webparts/recurringEvents/RecurringEventsTypes.ts",
+    "../src/webparts/recurringEvents/RecurringEventsCore.ts",
+    "RecurringEventsCore.test.ts"
+  ]
+}