Support batch operations

[inzanez]

Hi

would it make sense to implement batch operations like:

• insert / update / replace / delete multiple documents (so basically extend the single document methods on arangors::collection::Collection based on [this documentation])(https://www.arangodb.com/docs/stable/http/document-working-with-documents.html#create-multiple-documents).
• bulk import / export according to this documentation.

I guess this could be achieved using aql as well (bindvars with a Vec), but especially bulk import / export will give some performance benefits, according to the documentation.

[fMeow]

It certainly make sense. Maybe I would add this feature in the next minor update.