Codegen parameter for query json serialization #154

Job	Run time
Build Erlang projects (samples/server/petstore/erlang-server/)	26s
Build Erlang projects (samples/server/echo_api/erlang-server/)	25s
Build Erlang projects (samples/client/petstore/erlang-proper/)	16s
Build Erlang projects (samples/client/petstore/erlang-client/)	22s
	1m 29s

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