HPCC-12714 Support EMBEDDED DATASET syntax (currently ignored)

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-12714 Catch internal consistency errors more quickly

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-12714 Add an example which triggers the new error message

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #6733 from ghalliday/issue12714

HPCC-12714 Support EMBEDDED DATASET syntax (currently ignored)

Reviewed-By: Jamie Noss <james.noss@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>