change duringImpl logic to adapt overlapped date range

[shaunahu]

This PR fixes temporal DURING filtering so collection date ranges are matched by overlap rather than by requiring the record start/end to sit inside the query bounds.

Changes

• Updates DuringImpl to match records where temporal.start <= filterEnd and temporal.end >= filterStart.
• Includes ongoing records with no temporal.end when their start date overlaps the requested range.
• Updates REST API datetime tests to reflect the corrected range-overlap behaviour.
• Changes credit_contains from a match query to a match_phrase query for more precise credit field matching.

[utas-raymondng]

LGTM