LibGfx: Add initial ISO BMFF parsing and a utility to print file info

Currently, the `isobmff` utility will only print the media file type
info from the FileTypeBox (major brand and compatible brands), as well
as the names and sizes of top-level boxes.

Userland/Utilities/isobmff.cpp

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2023, Gregory Bertilson <Zaggy1024@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/MemoryStream.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/MappedFile.h>
+#include <LibGfx/ImageFormats/ISOBMFF/Reader.h>
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    Core::ArgsParser args_parser;
+
+    StringView path;
+    args_parser.add_positional_argument(path, "Path to ISO Base Media File Format file", "FILE");
+
+    args_parser.parse(arguments);
+
+    auto file = TRY(Core::MappedFile::map(path));
+    auto reader = TRY(Gfx::ISOBMFF::Reader::create(TRY(try_make<FixedMemoryStream>(file->bytes()))));
+    auto boxes = TRY(reader.read_entire_file());
+
+    for (auto& box : boxes)
+        box->dump();
+    return 0;
+}