Add Portal Settings Web Part with styles, localization, and tests

- Implemented the PortalSettings Web Part with a new manifest and TypeScript file.
- Created SCSS styles for the Web Part, defining various UI elements and responsive design.
- Added localization support for English and German languages.
- Developed tests for Provider Registry and static assets validation.
- Included PowerShell script for project validation.

package.json

@@ -1,24 +1,23 @@
 {
   "name": "portal-settings",
-  "version": "2.2.0",
+  "version": "3.0.0",
   "private": true,
   "main": "lib/index.js",
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=6.9.0 <9.0.0"
   },
   "scripts": {
     "build": "gulp bundle",
     "clean": "gulp clean",
-    "package": "gulp clean && gulp bundle --ship && gulp package-solution --ship",
-    "test": "gulp test"
+    "package": "npm test && gulp clean && gulp bundle --ship && gulp package-solution --ship",
+    "test": "tsc --noEmit -p . && tsc -p tests/tsconfig.json && node temp/tests/tests/ProviderRegistry.test.js && node tests/validate-static-assets.js && powershell -NoProfile -ExecutionPolicy Bypass -File ./tests/validate-project.ps1"
   },
   "dependencies": {
-    "@microsoft/sp-core-library": "~1.4.0",
-    "@microsoft/decorators": "~1.4.0",
+    "@microsoft/sp-http": "~1.4.1",
+    "@microsoft/sp-webpart-base": "~1.4.1",
+    "@microsoft/sp-office-ui-fabric-core": "~1.4.1",
     "@types/webpack-env": "1.13.1",
-    "@types/es6-promise": "0.0.33",
-    "@microsoft/sp-dialog": "~1.4.0",
-    "@microsoft/sp-application-base": "~1.4.0"
+    "@types/es6-promise": "0.0.33"
   },
   "devDependencies": {
     "@microsoft/sp-build-web": "~1.4.1",