[ndnSIM] Adding another "Name" type of field in Interest packet

[Junxiao Shi]

Hi Mudasir

Actually I need a std::string type of field carried in Interest,
> manipulated at intermediate nodes and reach to producer. Producer will read
> it and do its actions.
>

Interest is a network layer packet. Fields that change per hop does not
belong in network layer, but should be placed in link layer, ie NDNLP
header.
See
https://lo.calho.st/networks/adding-custom-packet-fields-to-packets-in-ndnsim-2-3-without-forking-the-entire-repository/
for a tutorial on adding a NDNLP header field.

Yours, Junxiao

>
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