Add comprehensive API tests for logs-to-logs joins with asymmetric data
sizes:
- 29 test cases covering INNER/LEFT/RIGHT/FULL joins, aggregations,
filters
- Subquery tests with IN/NOT IN, substr, length, CONCAT functions
- Tests run with both ZO_FEATURE_JOIN_MATCH_ONE_ENABLED=true and false
- Test data: logs_small.json (10 records) and logs_large.json (50
records)
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Co-authored-by: Claude <noreply@anthropic.com>