Add literal string types for prepare method

extension.neon

@@ -18,6 +18,7 @@ parameters:
 		- stubs/DBAL/Types/Type.stub
 		- stubs/DBAL/Exception.stub
 		- stubs/DBAL/Result.stub
+		- stubs/DBAL/Statement.stub
 		- stubs/DocumentManager.stub
 		- stubs/DocumentRepository.stub
 		- stubs/EntityManager.stub

stubs/DBAL/Connection.stub

@@ -10,6 +10,15 @@ use Throwable;
 
 class Connection
 {
+    /**
+     * Prepares an SQL statement.
+     *
+     * @param __doctrine-literal-string $sql The SQL statement to prepare.
+     *
+     * @throws Exception
+     */
+    public function prepare(string $sql): Statement;
+
     /**
      * Executes an SQL statement with the given parameters and returns the number of affected rows.
      *

stubs/DBAL/Connection4.stub

@@ -14,6 +14,15 @@ use Throwable;
  */
 class Connection
 {
+    /**
+     * Prepares an SQL statement.
+     *
+     * @param __doctrine-literal-string $sql The SQL statement to prepare.
+     *
+     * @throws Exception
+     */
+    public function prepare(string $sql): Statement;
+
     /**
      * Executes an SQL statement with the given parameters and returns the number of affected rows.
      *

stubs/DBAL/Statement.stub

@@ -0,0 +1,8 @@
+<?php
+
+namespace Doctrine\DBAL;
+
+class Statement
+{
+
+}