Add Expiry Indicator functionality with configuration and command set

- Implemented ExpiryItemService to manage expiry date logic for list items.
- Created ExpiryModels to define types and structures for expiry configurations and rules.
- Added RestError utility for handling API response errors.
- Developed ExpiryIndicatorFieldCustomizer to display expiry information in list views.
- Introduced ExpiryIndicatorCommandSet for extending expiry dates and managing settings.
- Added settings dialog for configuring expiry settings.
- Implemented localization support for English and German languages.
- Added TypeScript configuration files for project setup.
- Included TSLint configuration for code quality enforcement.

src/extensions/expiryIndicator/ExpiryIndicatorFieldCustomizer.module.scss

@@ -0,0 +1,27 @@
+.cell {
+  box-sizing: border-box;
+  display: block;
+  margin: -7px -11px;
+  min-height: 32px;
+  padding: 7px 11px;
+}
+
+.date {
+  font-weight: 600;
+}
+
+.label {
+  display: inline-block;
+  font-size: 11px;
+  margin-left: 8px;
+  opacity: .9;
+}
+
+.calculated {
+  border-bottom: 1px dotted currentColor;
+}
+
+.neutral {
+  color: #666666;
+}
+