Extended domainsList reducer, adding functionality to verify domains statuses

src/domains/data/index.ts

@@ -0,0 +1,7 @@
+import { ShlinkDomain } from '../../api/types';
+
+export type DomainStatus = 'validating' | 'valid' | 'invalid';
+
+export interface Domain extends ShlinkDomain {
+  status: DomainStatus;
+}