added common connection configuration

Author: transistive

src/Bolt/StateTransition.php renamed to src/Bolt/ServerStateTransition.php

@@ -85,11 +85,22 @@ final class StateTransitionRepository
     /** @var list<StateTransition> */
     private array $transitions;
 
-    public function __construct()
+    private function __construct()
     {
         $this->transitions = array_map(static fn ($x) => StateTransition::fromArray($x), self::TRANSITIONS);
     }
 
+    private static ?self $instance = null;
+
+    public static function getInstance(): self
+    {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+
+        return self::$instance;
+    }
+
     /**
      * @return array<string, string|null>
      */

src/Bolt/StateTransitionRepository.php renamed to src/Bolt/ServerStateTransitionRepository.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Laudis\Neo4j\Common;
+
+class ConnectionConfiguration
+{
+
+}