fix: update call_type field in AddAgentCallResponseRequest to use CallType enum and correct formatting in GateClient

Author: namtzigla

core/src/main/java/com/tcn/exile/gateclients/v2/GateClient.java

@@ -113,7 +113,7 @@ public Public.UpdateAgentStatusResponse updateAgentStatus(Public.UpdateAgentStat
 
     public Iterator<Public.ListAgentsResponse> listAgents(Public.ListAgentsRequest request) {
         return executeRequest("listAgents", client -> client.listAgents(request));
-    }
+     }
 
     public Public.UpsertAgentResponse upsertAgent(Public.UpsertAgentRequest request) {
         return executeRequest("upsertAgent", client -> client.upsertAgent(request));

protos/src/main/proto/tcnapi/exile/gate/v2/public.proto

@@ -655,7 +655,7 @@ message StartCallRecordingResponse {}
 message AddAgentCallResponseRequest {
   string partner_agent_id = 1;
   string call_sid = 2;
-  string call_type = 3;
+  CallType call_type = 3;
   int64 current_session_id = 4;
   // key value pair to save
   string key = 6;