Add firsdt-class NetCDF4 file support through NDBC DODS/THREDDS

[CDJellen]

Summary of core changes:

• first-class support for downloading, joining, and filtering netcdf4 files made available through the NDBC DODS THREDDS server (requested in api.stations() not returning all stations #40 )
• new parameter in the API's get_data method for retrieving this data use_opendap=True
• updated tests
• updated documentation notebook.

New dependencies:

• added dependency netcdf4 == 1.7.1.post2 to poetry-managed installations

Version Support changes:

• dropped support of python 3.8 for poetry-managed installations
• bumped versions of some package dependencies while maintaining numpy<2.0.0

Planned future changes:

• none noted, bugfixes will take priority