HPCC-11435 ecl-queries "file" command to list files used by query

ecl queries files target queryid

Lists the files currently referenced by the query.  Includes size and
number of parts.

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #6024 from afishbeck/eclcmdListQueryFiles

HPCC-11435 ecl-queries "file" command to list files used by query

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>