Ocaml_protoc_compiler_lib.Pb_loggerSourceLogging functionality allow printing debugging information
setup_from_out_channel oc will configure the logger to print all logging statement to oc.
Function can be called multiple times, each call will disable (override) the previously setup out channel
log format x y same as Printf.printf except that the message will get printed to the previously setup out_channel in the setup_from_out_channel function.
endline format x y same as Pervasives.print_endline except that the message will get printed to the previously setup out_channel in the setup_from_out_channel function.