Add test for nested split obj with io rule.

[pcanal]

We still need to merge a series of test for the PR #18320
This includes

• a test (and a related tutorial documentation) for schema evolving from a std::auto_ptr
• the test update activate 9899 (9924) test roottest#1300 (for I/O customization rule not run for a all-transient nested objects in a split branch. #9924)
• the test indicated at its.cern.ch/jira/browse/ROOT-10271
• documentation and/or addition feature request for For its.cern.ch/jira/browse/ROOT-118