Prepare Data History Provider 2.7 integration update

- modularize Citrix and agent integrations and add remote desktop endpoints
- extend ticket overview, ticket links, token validation, and staged relation handling
- update configuration, licensing, project, signing, and publish artifacts

F4SD-Cockpit-ServerCore/Modules/Agent/AgentRemoteDesktopManager.cs

@@ -0,0 +1,46 @@
+using C4IT.DataHistoryProvider.Base.DataSources;
+using C4IT.FASD.Base;
+using C4IT.FASD.Communication.Agent;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace C4IT.DataHistoryProvider.Base.Modules.Agent
+{
+    public class AgentRemoteDesktopManager : IRemoteDesktopManager<AgentRemoteConnectionInfo, AgentRemoteClientInfo, AgentRemoteConnectionStatusDto>
+    {
+        private readonly AgentApiHandler _agentApiHandler;
+
+        public AgentRemoteDesktopManager(cAgentApiConfiguration agentConfig)
+        {
+            _agentApiHandler = new AgentApiHandler(agentConfig);
+        }
+
+        public async Task<AgentRemoteConnectionStatusDto> GetConnectionStatus(Guid connectionId)
+        {
+            return await _agentApiHandler.Request<AgentRemoteConnectionStatusDto>($"api/management/c4it/phoenix-connections/{connectionId}/status", HTTP.eHttpMethod.get);
+        }
+
+        public async Task<AgentRemoteConnectionInfo> InitiateConnectionOfClient(AgentRemoteClientInfo clientInfos, bool isElevated, CancellationToken token)
+        {
+            string url = "api/management/c4it/phoenix-connections";
+            if (isElevated)
+                url += "/admin";
+
+            return await _agentApiHandler.Request<AgentRemoteConnectionInfo>(url, HTTP.eHttpMethod.post, clientInfos, token);
+        }
+
+        public async Task TerminateConnection(Guid connectionId)
+        {
+            await _agentApiHandler.Request($"api/management/c4it/phoenix-connections/{connectionId}", HTTP.eHttpMethod.delete);
+        }
+
+        public bool IsActive() => true;
+
+        public Task<HealthInformation> GetHealthInfo()
+        {
+            // todo Agent Server has to implement an "health" endpoint and return its result
+            return Task.FromResult(new HealthInformation(HealthStatus.healthy));
+        }
+    }
+}