gelf logging support for slog

[disassembler]

Is your feature request related to a problem/context ? Please describe if applicable.
We'd like to have gelf logging support via slog so we can send logs to a 3rd party service that supports gelf. The main reason for this is slog-syslog does not support windows so the only way to setup logging on windows to send to a 3rd party server would be to instruct end users to install nixlog, configure it to read a log file and forward it to a syslog server. Having gelf support to be able to send directly to graylog would be much simpler for the user to enable.
Describe the solution you'd like
Add gelf slog support (either with a custom implmenetation or 3rd party library)

[mzabaluev]

There is an unpublished crate that claims to integrate gelf support into slog.