[th/nm-ptr-array] add and use NMPtrArray

Closed Thomas Haller requested to merge th/nm-ptr-array into main

NMPtrArray was introduced while working on a fix for https://bugzilla.redhat.com/show_bug.cgi?id=2060684, but it ended up being independent.

It was also previously on review on !1469 (closed). !1469 (closed) got closed and is deprecated by this (and other merge requests).

Here again.

What Beniamino said:

is still relevant on this MR.

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