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Switch to encoding/protojson

Signed-off-by: Simon Engledew <b7bfd6f11fd05fb2bf1757c6a3407b2a598e57c3@github.com>

mahak/vitess,mahak/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,mahak/vitess