gh-36096: add ordered set partitions as supported findstat collection

    
findstat.org supports a new collection, ordered set partitions.  This
has to be reflected by the sage interface.

Fixes #35968

- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
    
URL: #36096
Reported by: Martin Rubey
Reviewer(s): Frédéric Chapoton

src/sage/databases/findstat.py

@@ -259,6 +259,7 @@ def mapping(sigma):
 from sage.combinat.colored_permutations import SignedPermutation, SignedPermutations
 from sage.combinat.plane_partition import PlanePartition
 from sage.combinat.decorated_permutation import DecoratedPermutation, DecoratedPermutations
+from sage.combinat.set_partition_ordered import OrderedSetPartition, OrderedSetPartitions
 
 ######################################################################
 # the FindStat URLs
@@ -4673,7 +4674,13 @@ def name(self, style="singular"):
                                                            for i, v in enumerate(x, 1))) + "]",
                                  DecoratedPermutations,
                                  lambda x: x.size(),
-                                 lambda x: isinstance(x, DecoratedPermutation))}
+                                 lambda x: isinstance(x, DecoratedPermutation)),
+    "OrderedSetPartitions":
+    _SupportedFindStatCollection(lambda x: OrderedSetPartition(literal_eval(x.replace('{','[').replace('}',']'))),
+                                 str,
+                                 OrderedSetPartitions,
+                                 lambda x: x.size(),
+                                 lambda x: isinstance(x, OrderedSetPartition))}
 
 
 class FindStatCollections(UniqueRepresentation, Parent):