make WriteCachedReferenceDatasetQuery importable (#733)

Author: jklugherz

v03_pipeline/lib/tasks/__init__.py

@@ -1,4 +1,7 @@
 from v03_pipeline.lib.tasks.delete_old_runs import DeleteOldRunsTask
+from v03_pipeline.lib.tasks.reference_data.write_cached_reference_dataset_query import (
+    WriteCachedReferenceDatasetQuery,
+)
 from v03_pipeline.lib.tasks.update_project_table import UpdateProjectTableTask
 from v03_pipeline.lib.tasks.update_sample_lookup_table import (
     UpdateSampleLookupTableTask,
@@ -16,6 +19,7 @@
     'UpdateProjectTableTask',
     'UpdateSampleLookupTableTask',
     'UpdateVariantAnnotationsTableWithNewSamplesTask',
+    'WriteCachedReferenceDatasetQuery',
     'WriteMetadataForRunTask',
     'WriteProjectFamilyTablesTask',
 ]