HPCC-9089 Improve Roxie basic JSON formatting

Clean up basic JSON formatting to represent of each output as
a block.

Signed-off-by: Anthony Fishbeck <Anthony.Fishbeck@lexisnexis.com>
Merge pull request #4196 from afishbeck/simple_json_formatting

HPCC-9089 Improve Roxie basic JSON formatting

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>