feat(interface): allow message to be string or array

This update to the api.interface now accepts both strings and arrays for the 'message' field inside the IAbstractApiResponse interface. This provides more flexibility for responses returned by the API.

src/interfaces/api.interface.ts

@@ -21,7 +21,7 @@ export interface IApiLoginReq {
 // -----   Response   -----
 
 export interface IAbstractApiResponse {
-	message?: Array<string>;
+	message?: Array<string> | string;
 	error?: string;
 	statusCode?: number;
 }