Add filter functionality and async retrieval

Introduce a new `_filters` constant in `_data.ts` that defines various filter objects for invoices and related data. Update `filter-service.ts` to import `_filters` and define the `Filter` type. Implement `getFiltersAsync` function to asynchronously retrieve the filter data.

src/client/dd-hub-react/src/_mock/_data.ts

@@ -1,3 +1,5 @@
+import { Filter } from 'src/api/filter-service';
+
 import {
   _id,
   _price,
@@ -208,3 +210,16 @@ export const _notifications = [
     isUnRead: false,
   },
 ];
+
+export const _filters: Filter[] = [
+  { id: 1, label: 'Rechnungsnummer', name: 'invoiceNumber', type: 'VARCHAR' },
+  { id: 2, label: 'Kundenname', name: 'customerName', type: 'VARCHAR' },
+  { id: 3, label: 'Startdatum', name: 'startDate', type: 'DATE' },
+  { id: 4, label: 'Enddatum', name: 'endDate', type: 'DATE' },
+  { id: 5, label: 'Status der Rechnung', name: 'status', type: 'VARCHAR' },
+  { id: 6, label: 'Mindestbetrag', name: 'minAmount', type: 'DECIMAL' },
+  { id: 7, label: 'Höchstbetrag', name: 'maxAmount', type: 'DECIMAL' },
+  { id: 8, label: 'Steuer inbegriffen?', name: 'taxIncluded', type: 'BOOLEAN' },
+  { id: 9, label: 'Währung', name: 'currency', type: 'VARCHAR' },
+  { id: 10, label: 'Erstellungsdatum', name: 'createdAt', type: 'DATE' }
+];

src/client/dd-hub-react/src/api/filter-service.ts

@@ -1,3 +1,5 @@
+import { _filters } from 'src/_mock/_data';
+
 export type Type = 'BOOLEAN' | 'DATE' | 'VARCHAR' | 'INTEGER' | 'DECIMAL';
 
 export type Filter = {
@@ -5,4 +7,8 @@ export type Filter = {
     label: string;
     name: string;
     type: Type;
-};
+};
+
+export function getFiltersAsync(): Promise<Filter[]> {
+    return Promise.resolve(_filters);
+}