Rewrite the Component PickWorkflow.vue into typescript

src/Bundle/ChillMainBundle/Resources/public/lib/entity-workflow/api.ts

@@ -0,0 +1,8 @@
+export const buildLinkCreate = (workflowName: string, relatedEntityClass: string, relatedEntityId: number): string => {
+    let params = new URLSearchParams();
+    params.set('entityClass', relatedEntityClass);
+    params.set('entityId', relatedEntityId.toString(10));
+    params.set('workflow', workflowName);
+
+    return `/fr/main/workflow/create?`+params.toString();
+};