Allow specifying of update fields in bulk_update_typesense_records

[EricOuma]

Is your feature request related to a problem? Please describe

The bulk_update_typesense_records loads all fields for an update. These might not be necessary if one only wants to update specific fields.

Describe the solution you'd like

Add an update_fields kwarg to the method. This will eventually be passed to update_batch which will use it as expected.

Describe alternatives you've considered

N/A

Additional context
N/A