Fixed overwrite issue

Fixed the issue which allowed devs to overwrite the service and group

src/Client.php

@@ -266,7 +266,9 @@ public function disconnect(): self
 
     public function service(string $name, string $description, string $version): Service
     {
-        $this->services[$name] = new Service($this, $name, $description, $version);
+        if (!array_key_exists($name, $this->services)) {
+            $this->services[$name] = new Service($this, $name, $description, $version);
+        }
 
         return $this->services[$name];
     }

src/Service/Service.php

@@ -113,7 +113,9 @@ private function stats(): array
 
     public function addGroup(string $name): ServiceGroup
     {
-        $this->groups[$name] = new ServiceGroup($this, $name);
+        if (!array_key_exists($name, $this->groups)) {
+            $this->groups[$name] = new ServiceGroup($this, $name);
+        }
 
         return $this->groups[$name];
     }
@@ -134,6 +136,10 @@ public function addEndpoint(
             $queue_group = $options['queue_group'];
         }
 
+        if (array_key_exists($name, $this->endpoints)) {
+            throw new \LogicException("Endpoint $name already is defined");
+        }
+
         $this->endpoints[$name] = new ServiceEndpoint(
             $this,
             $name,
@@ -145,9 +151,12 @@ public function addEndpoint(
 
     public function reset(): void
     {
-        array_map(function (ServiceEndpoint $endpoint) {
-            $endpoint->resetStats();
-        }, $this->endpoints);
+        array_map(
+            function (ServiceEndpoint $endpoint) {
+                $endpoint->resetStats();
+            },
+            $this->endpoints
+        );
     }
 
     private function registerVerbs(): void

src/Service/ServiceGroup.php

@@ -13,7 +13,9 @@ public function __construct(
 
     public function addGroup(string $name): ServiceGroup
     {
-        $this->groups[$name] = new ServiceGroup($this->service, $this->name . '.' . $name);
+        if (!array_key_exists($name, $this->groups)) {
+            $this->groups[$name] = new ServiceGroup($this->service, $this->name . '.' . $name);
+        }
 
         return $this->groups[$name];
     }