feat(antd-imports): establish centralized import rules for Ant Design components

- Introduced a new rules file for Ant Design component imports, enforcing the use of centralized imports from `@antd-imports` to enhance tree-shaking, maintainability, and performance.
- Updated various components to replace direct imports from 'antd' and '@ant-design/icons' with the centralized import path.
- Refactored existing components to utilize memoization and callbacks for improved performance and readability.
- Enhanced the billing and configuration components with updated styles and improved user experience.

worklenz-frontend/src/shared/antd-imports.ts

@@ -50,6 +50,7 @@ import {
   message,
   notification,
   theme,
+  Statistic,
 } from 'antd';
 
 // Icons - Import commonly used ones
@@ -145,6 +146,7 @@ export {
   message,
   notification,
   theme,
+  Statistic,
 };
 
 // TypeScript Types - Import commonly used ones