implement custom datetime and date widgets based on customer requirements

src/wce_crm/form_defs.py

@@ -16,7 +16,9 @@ class FormFieldType(enum.StrEnum):
     TEXT = enum.auto()
     LONGTEXT = enum.auto()
     DATE = enum.auto()
+    DATE_FLEXIBLE = enum.auto()
     DATETIME = enum.auto()
+    DATETIME_FLEXIBLE = enum.auto()
     DROPDOWN = enum.auto()
     EXTENDED_DROPDOWN = enum.auto()
     DYNAMIC_LIST = enum.auto()