I know how to read an option within Message by using GetExtension on the 
Message, but can I do that for a global option that is not encapsulated 
within a message?

So in C++, how would I read the "my_file_name" option from the proto below?

extend google.protobuf.FileOptions {
  string my_file_name = 1001;
}

extend google.protobuf.MessageOptions {
  optional string my_option = 51234;
}

option (my_file_name) = "filename.txt";

message MyMessage {
  option (my_option) = "Hello world!";
}

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