Newest 1.6.0 breaks support for streaming large JSON resultsets

[tobia]

Up until version 1.5.3 we were using Client::streamRead() in order to read very large JSON resultsets (hundreds of MB) which would crash PHP if you attempted to json_decode() them.

This no longer works in 1.6.0, because now it always calls json_decode() behind the scenes, even when using streamRead()

This is because Client::streamRead() calls Transport\Http::streamRead() which calls Transport\Http::streaming() which creates a Statement and calls Statement::isError() which calls Statement::hasErrorClickhouse() which now does a full json_decode() of the response whenever the response is of JSON type.

Could you please remove this additional JSON decoding inside hasErrorClickhouse() or provide an option to turn it off?