Handling dls_design with connector when fitting min_curve

[jonnymaserati]

Need to modify the function below to better handle fitting a min_curve to a tight survey, by processing a dls_design=None parameter to initiate a radius_design to a high number (e.g. inf) and force radius_critical to be utilized.

https://github.com/jonnymaserati/welleng/blob/2c4ed3d2da74c1fd6f03b12ecec867b4ceeac1a9/welleng/connector.py#L411