Support ignore_conflicts parameter in bulk_create_with_history

[shihanng]

Problem Statement
Django 2.2 includes ignore_conflicts parameter into bulk_create(). Would it be possible for django-simple-history to allow the same parameter to be passed into bulk_create_with_history()?

Documentation: https://docs.djangoproject.com/en/2.2/ref/models/querysets/#django.db.models.query.QuerySet.bulk_create

Describe the solution you'd like
Update bulk_create_with_history() with following signature:

def bulk_create_with_history(
    objs,
    model,
    batch_size=None,
    ignore_conflicts=False,
    default_user=None,
    default_change_reason=None,
    default_date=None,
):

Describe alternatives you've considered
N/A

Additional context
N/A