LibGL: Refactor TextureNameAllocator to a more general NameAllocator

This functionality can also be used for other types of objects.

Userland/Libraries/LibGL/NameAllocator.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Stack.h>
+#include <LibGL/GL/gl.h>
+
+namespace GL {
+
+class NameAllocator {
+public:
+    NameAllocator() = default;
+
+    void allocate(GLsizei count, GLuint* names);
+    void free(GLuint name);
+    bool has_allocated_name(GLuint name) const;
+
+private:
+    Stack<GLuint, 512> m_free_names;
+    GLuint m_last_id { 1 };
+};
+
+}