Update Springshare OAI sources date handling

Why these changes are being introduced:
* Setting date.kind=None was throwing errors in TIMDEX api

How this addresses that need:
* Determined Springshare dates were created, sets to "Created"
* Sets generic OAI transformer to "Unknown", though should not be used directly

Side effects of this change:
* All Springshare records will need to be rerun to get updated date.kind properties.

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/TIMX-241

tests/test_oai_dc.py

@@ -74,5 +74,5 @@ def test_oaidc_generic_date():
     transformer_instance = OaiDc("libguides", input_records)
     xml = next(transformer_instance.input_records)
     assert transformer_instance.get_dates("test_source_record_id", xml) == [
-        timdex.Date(kind=None, note=None, range=None, value="2008-06-19T17:55:27")
+        timdex.Date(kind="Unknown", note=None, range=None, value="2008-06-19T17:55:27")
     ]

tests/test_springshare.py

@@ -60,7 +60,9 @@ def test_springshare_get_dates_valid():
     for xml in transformer_instance.input_records:
         date_field_value = transformer_instance.get_dates("test_get_dates", xml)
         assert date_field_value == [
-            timdex.Date(kind=None, note=None, range=None, value="2000-01-01T00:00:00")
+            timdex.Date(
+                kind="Created", note=None, range=None, value="2000-01-01T00:00:00"
+            )
         ]
 
 
@@ -106,7 +108,7 @@ def test_libguide_transform_with_all_fields_transforms_correctly():
             )
         ],
         dates=[
-            timdex.Date(value="2008-06-19T17:55:27"),
+            timdex.Date(value="2008-06-19T17:55:27", kind="Created"),
         ],
         format="electronic resource",
         identifiers=[
@@ -160,7 +162,7 @@ def test_research_databases_transform_with_all_fields_transforms_correctly():
         "researchdatabases. https://libguides.mit.edu/llba",
         content_type=["researchdatabases"],
         dates=[
-            timdex.Date(value="2022-01-28T22:15:37"),
+            timdex.Date(value="2022-01-28T22:15:37", kind="Created"),
         ],
         format="electronic resource",
         identifiers=[

transmogrifier/sources/oaidc.py

@@ -137,7 +137,7 @@ def get_dates(self, source_record_id: str, xml: Tag) -> Optional[List[timdex.Dat
                     date_str,
                     source_record_id,
                 ):
-                    dates.append(timdex.Date(value=date_str))
+                    dates.append(timdex.Date(value=date_str, kind="Unknown"))
         return dates or None
 
     def get_links(self, source_record_id: str, xml: Tag) -> Optional[List[timdex.Link]]:

transmogrifier/sources/springshare.py

@@ -51,7 +51,7 @@ def get_dates(self, source_record_id: str, xml: Tag) -> Optional[List[timdex.Dat
                 date_iso_str,
                 source_record_id,
             ):
-                dates.append(timdex.Date(value=date_iso_str, kind=None))
+                dates.append(timdex.Date(value=date_iso_str, kind="Created"))
         return dates or None
 
     def get_links(self, source_record_id: str, xml: Tag) -> Optional[List[timdex.Link]]: