refactor: remove csharp support

Since 2 year we not updated the csharp connector. We currently have no time to do this, furthermore we have no high need for it.
In order to avoid confusion I would remove the current code and create new if we have time for it.

README.md

@@ -47,24 +47,6 @@ final ZeebeHazelcast zeebeHazelcast = ZeebeHazelcast.newBuilder(hz)
 
 zeebeHazelcast.close();
 ```
-
-### C# Application
-
-Add the nuget package `zeebe hazelcast connector(???)` to your project.
-
-Example usage:
-```csharp
-    // Start the Hazelcast Client and connect to an already running Hazelcast Cluster on 127.0.0.1
-    var hz = HazelcastClient.NewHazelcastClient();
-    // Get a Topic called "zeebe-deployments"
-    var topic = hz.GetTopic<byte[]>("zeebe-deployments");
-
-     // Add a Listener to the Topic
-    DeploymentListener.Consumer consumer = (record) => Console.WriteLine(record.ToString());
-    topic.AddMessageListener(new DeploymentListener(consumer));
-
-```
-
 ## Install
 
 ### Docker