Support bulk insert

Django supports notifying the driver that it wants to create objects in bulk with `bulk_create`, e.g:

```python
>>> objs = Entry.objects.bulk_create(
... [
... Entry(headline="This is a test"),
... Entry(headline="This is only a test"),
... ]
... )
```
In CrateDB bulk inserts in the http protocol can be implemented with [bulk_args](https://cratedb.com/docs/crate/reference/en/latest/interfaces/http.html#bulk-operations).

We should bridge both PRs to implement fast bulk insertion

Start by tracing how Django's bulk_create operation is handled and compare it with CrateDB's HTTP bulk_args documentation. The work is done when Django bulk_create uses the HTTP bulk operation for fast insertion and preserves the behavior shown in the issue's example.

Written by the indexing model from the issue text.