Metadata modules for PageLayoutTab PageLayoutWidget (#16662)

# Introduction
Creating dedicated folders and module for both `page-layout-tab` and
`page-layout-widget`

The addition diff with deletion is due to the module being added

packages/twenty-server/src/engine/metadata-modules/page-layout-tab/exceptions/page-layout-tab.exception.ts

@@ -0,0 +1,59 @@
+import { type MessageDescriptor } from '@lingui/core';
+import { msg } from '@lingui/core/macro';
+import { assertUnreachable } from 'twenty-shared/utils';
+
+import { CustomException } from 'src/utils/custom-exception';
+
+export enum PageLayoutTabExceptionCode {
+  PAGE_LAYOUT_TAB_NOT_FOUND = 'PAGE_LAYOUT_TAB_NOT_FOUND',
+  INVALID_PAGE_LAYOUT_TAB_DATA = 'INVALID_PAGE_LAYOUT_TAB_DATA',
+}
+
+export enum PageLayoutTabExceptionMessageKey {
+  PAGE_LAYOUT_TAB_NOT_FOUND = 'PAGE_LAYOUT_TAB_NOT_FOUND',
+  TITLE_REQUIRED = 'TITLE_REQUIRED',
+  PAGE_LAYOUT_ID_REQUIRED = 'PAGE_LAYOUT_ID_REQUIRED',
+  PAGE_LAYOUT_NOT_FOUND = 'PAGE_LAYOUT_NOT_FOUND',
+  PAGE_LAYOUT_TAB_NOT_DELETED = 'PAGE_LAYOUT_TAB_NOT_DELETED',
+}
+
+const pageLayoutTabExceptionUserFriendlyMessages: Record<
+  PageLayoutTabExceptionCode,
+  MessageDescriptor
+> = {
+  [PageLayoutTabExceptionCode.PAGE_LAYOUT_TAB_NOT_FOUND]: msg`Page layout tab not found.`,
+  [PageLayoutTabExceptionCode.INVALID_PAGE_LAYOUT_TAB_DATA]: msg`Invalid page layout tab data.`,
+};
+
+export class PageLayoutTabException extends CustomException<PageLayoutTabExceptionCode> {
+  constructor(
+    message: string,
+    code: PageLayoutTabExceptionCode,
+    { userFriendlyMessage }: { userFriendlyMessage?: MessageDescriptor } = {},
+  ) {
+    super(message, code, {
+      userFriendlyMessage:
+        userFriendlyMessage ?? pageLayoutTabExceptionUserFriendlyMessages[code],
+    });
+  }
+}
+
+export const generatePageLayoutTabExceptionMessage = (
+  key: PageLayoutTabExceptionMessageKey,
+  value?: string,
+): string => {
+  switch (key) {
+    case PageLayoutTabExceptionMessageKey.PAGE_LAYOUT_TAB_NOT_FOUND:
+      return `Page layout tab with ID "${value}" not found`;
+    case PageLayoutTabExceptionMessageKey.TITLE_REQUIRED:
+      return 'Page layout tab title is required';
+    case PageLayoutTabExceptionMessageKey.PAGE_LAYOUT_ID_REQUIRED:
+      return 'Page layout ID is required';
+    case PageLayoutTabExceptionMessageKey.PAGE_LAYOUT_NOT_FOUND:
+      return 'Page layout not found';
+    case PageLayoutTabExceptionMessageKey.PAGE_LAYOUT_TAB_NOT_DELETED:
+      return 'Page layout tab is not deleted and cannot be restored';
+    default:
+      assertUnreachable(key);
+  }
+};