Everywhere: Make ByteBuffer::{create_*,copy}() OOM-safe

Author: https://github.com/alimpfard
Commit: 97e97bccab
Pull-request: https://github.com/SerenityOS/serenity/pull/9832
Reviewed-by: https://github.com/IdanHo

AK/Base64.cpp

@@ -87,7 +87,8 @@ ByteBuffer decode_base64(const StringView& input)
             output.append(out2);
     }
 
-    return ByteBuffer::copy(output.data(), output.size());
+    // FIXME: Handle OOM failure.
+    return ByteBuffer::copy(output).release_value();
 }
 
 String encode_base64(ReadonlyBytes input)