Completing renaming of dax_ppdb into dax_apdb

Tags: #<Tag:0x00007fdd79876118>

I think that all affected parties are aware of this move but still want to (and have to) make this known to wider community. I’m planning to complete the long process of renaming of dax_ppdb package into dax_apdb today. Motivation for that move is described in RFC-642. All or most of the dependent code has been updated in DM-22039. As always we do not anticipate any issues after this move but are prepared to handle any unexpected issues as they appear.