add some default types to de-duplicate similar implmentations

Pilz.Net/Api/Client/BaseItemClient.cs

@@ -0,0 +1,12 @@
+using Pilz.Net.Api.Messages;
+using Pilz.Net.Data;
+
+namespace Pilz.Net.Api.Client;
+
+public abstract class BaseItemClient<T>(IApiClient client) : BaseClient<T>(client), IBaseItemClient<T> where T : IDataObject
+{
+    public virtual async Task<IEnumerable<T>> GetAll() 
+    {
+        return (await client.SendRequest<GeneralItemMessages<T>.Items>(ApiEndpoint, HttpMethod.Get)).EnsureOk().Items;
+    }
+}