Add literal string types for prepare method

Author: BackEndTea

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.
      *