Meta+LibCrypto: Add SecureRandom and replace PRNG usage with it

This adds a thin wrapper to LibCrypto for generating cryptographically
secure random values and replaces current usages of PRNG within
LibCrypto as well.

Libraries/LibCrypto/SecureRandom.cpp

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2024, the Ladybird developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCrypto/SecureRandom.h>
+
+#include <openssl/rand.h>
+
+namespace Crypto {
+
+void fill_with_secure_random(Bytes bytes)
+{
+    auto const size = static_cast<int>(bytes.size());
+
+    if (RAND_bytes(bytes.data(), size) != 1)
+        VERIFY_NOT_REACHED();
+}
+
+}