Draft: third-party: Add nlohmann/json to ns-3 third-party directory

Kedar Kisanrequested to merge
k.kedar/ns-3-dev:nlohmann-json into master

This Draft MR adds the vendored nlohmann/json library to the third-party/ directory.

This is planned to support the GSoC Flent project (and can be used for future JSON dependencies).

Edited by Tom Henderson

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