meson: Provide wrap for nlohmann

Currently on the system without nlohmann installed local build fails
with error:
"""
../test/include/bej_common_test.hpp:5:10: fatal error:
nlohmann/json.hpp: No suc

meson: Provide wrap for nlohmann

Currently on the system without nlohmann installed local build fails
with error:
"""
../test/include/bej_common_test.hpp:5:10: fatal error:
nlohmann/json.hpp: No such file or directory
5 | #include "nlohmann/json.hpp"
"""
Provide wrap file for nlohmann and add the necessary dependency to fix
the issue.

Tested:
Local build via "meson setup build && cd build && meson compile" now
finishes without errors.

Change-Id: I8d63dac6f8963c7da2c5831a1fb1998663a12f6f
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>

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