Prompt object injection of non-TObject

[dpiparo]

Feature description

https://root-forum.cern.ch/t/cant-obtain-std-vector-from-root-file-by-name/28331/4

TCling::GetObjectAddress() currently works only with TObjects.

[dpiparo]

@hageboeck I promoted this from JIRA since I found useful to discuss how to proceed (or not) with this feature in view of ROOT7.

[jblomer]

Related: #19259