getEntries could load contents in bulk for withContent=true

[XN137]

as discussed in this comment (PR later merged here)

content is loaded per entry here (or here)

but since the getEntries result is paginated (and/or goes through the batch access check) there are timeframes where we have a batch of entries, so we could bulk load their content to avoid multiple roundtrips to the backend store.

for example instead of calling this could use that