feat: start rewriting data import as the import wizard

tests/testImporter.spec.ts

@@ -0,0 +1,14 @@
+import { ModelNameEnum } from 'models/types';
+import { Importer } from 'src/importer';
+import test from 'tape';
+import { closeTestFyo, getTestFyo, setupTestFyo } from './helpers';
+
+const fyo = getTestFyo();
+setupTestFyo(fyo, __filename);
+
+test('importer', async (t) => {
+  const importer = new Importer(ModelNameEnum.SalesInvoice, fyo);
+  t.ok(importer.getCSVTemplate());
+});
+
+closeTestFyo(fyo, __filename);