Drift: PMIx_Data_array manipulation functions

Part of https://github.com/openpmix/pmix-tests/pull/160.
```
#---------------------------------------------------------
# Needs Review:
#  OpenPMIx: dfab3b3
#  OpenPMIx PR:
#  PMIx Standard Issue:
#---------------------------------------------------------
PMIx_Data_array_construct
PMIx_Data_array_create
PMIx_Data_array_free
PMIx_Data_array_init
```