ENH: add resolve_value to Property

https://gitlab.com/caosdb/caosdb-pylib/-/merge_requests/64

unittests/test_apiutils.py

@@ -73,7 +73,7 @@ def test_id_query():
 def test_resolve_reference():
     original_retrieve_entity_with_id = caosdb.apiutils.retrieve_entity_with_id
     caosdb.apiutils.retrieve_entity_with_id = lambda eid: db.Record(id=eid)
-    
+
     prop = db.Property(id=1, datatype=db.REFERENCE, value=100)
     prop.is_valid = lambda: True
     items = [200, 300, 400]
@@ -95,7 +95,7 @@ def test_resolve_reference():
         assert i.id == 500
         assert isinstance(i, db.Entity)
 
-    no_reference= db.Property(id=5000, datatype=db.INTEGER, value=2)
+    no_reference = db.Property(id=5000, datatype=db.INTEGER, value=2)
     resolve_reference(no_reference)
     assert no_reference.value == 2
     assert no_reference.datatype is db.INTEGER