derp: add debug traffic handler

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This adds a handler on the DERP server for logging bytes send and received by clients of the
server, by holding open a connection and recording if there is a difference between the number
of bytes sent and received. It sends a JSON marshalled object if there is an increase in the
number of bytes.

Signed-off-by: julianknodt <julianknodt@gmail.com>

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