Enhance / Overlead App.Data.Create with multiple entities in one step

[iJungleboy]

I'm submitting a ...
[x] feature request

...about
[x] Content Types or data management
[x] APIs like REST

Current behavior
App.Data.Create can only add one item at a moment, adding many at a time would sometimes be desired - and much faster.

What is the motivation / use case for changing the behavior?
More performance.

• 2sxc version(s): 9.14 LTS