Add option to set the default date when bulk creating or updating

[sbor23]

It would be nice if the date of history entries could be set when creating or updating multiple instances.
Similar to what exists with the change_reason and default_user.

Describe the solution you'd like
The HistoryManager.bulk_history_create() method should accept an keyword argument default_date which is considered for setting the date on new history entries with higher precedence than _history_date on the original instance.
The same should exposed on the utility functions bulk_create_with_history() and bulk_update_with_history().