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.

src/core/ObjectPath.ts

@@ -0,0 +1,46 @@
+// tslint:disable:no-any
+export function getPathValue(source: any, path: string): any {
+  if (!path) { return source; }
+  const parts: string[] = path.split('.');
+  let current: any = source;
+  for (let i: number = 0; i < parts.length; i++) {
+    if (current === undefined || current === null) { return undefined; }
+    current = current[parts[i]];
+  }
+  return current;
+}
+
+export function setPathValue(target: any, path: string, value: any): void {
+  const parts: string[] = path.split('.');
+  let current: any = target;
+  for (let i: number = 0; i < parts.length - 1; i++) {
+    if (!current[parts[i]] || typeof current[parts[i]] !== 'object') {
+      current[parts[i]] = {};
+    }
+    current = current[parts[i]];
+  }
+  current[parts[parts.length - 1]] = value;
+}
+
+export function cloneValue<T>(value: T): T {
+  return JSON.parse(JSON.stringify(value));
+}
+
+export function mergePreservingUnknown(original: any, edited: any): any {
+  if (!isObject(original) || !isObject(edited)) { return cloneValue(edited); }
+  const result: any = cloneValue(original);
+  Object.keys(edited).forEach((key: string): void => {
+    result[key] = isObject(result[key]) && isObject(edited[key])
+      ? mergePreservingUnknown(result[key], edited[key])
+      : cloneValue(edited[key]);
+  });
+  return result;
+}
+
+export function isEmptyValue(value: any): boolean {
+  return value === undefined || value === null || value === '' || (Array.isArray(value) && value.length === 0);
+}
+
+function isObject(value: any): boolean {
+  return !!value && typeof value === 'object' && !Array.isArray(value);
+}