Add batch mutation for update and delete operation

[Hnagzhi]

Description

Even though batch creation of objects was already implemented a while ago (see #3), it is still not possible to update/delete objects in a batch.

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[bellini666]

Hey @Hnagzhi ,

Actually it is possible, you should use filters in the mutation as is explained here: https://strawberry-graphql.github.io/strawberry-graphql-django/guide/mutations/#filtering

Looking at the doc now I understand that it can be confusing and should be improved =P