Review Request 42543: Added overloads for `JSON::NumberWriter` and `json` to handle `size_t`.

[Michael Park]

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Review request for mesos and Benjamin Hindman.


Bugs: MESOS-4435
    https://issues.apache.org/jira/browse/MESOS-4435


Repository: mesos


Description
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See summary.


Diffs
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  3rdparty/libprocess/3rdparty/stout/include/stout/jsonify.hpp 
a87b9e2ade68eabd8560470b211a4703f3183d73 

Diff: https://reviews.apache.org/r/42543/diff/


Testing
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`make check`


Thanks,

Michael Park