Add support for NetCDF

[MartinPontius]

Is your feature request related to a problem? Please describe.
I would like to use the library to create NetCDF coverage stores and layers, e.g. with the create_coveragestore method.
At the moment this is not possible because the allowed_types list doesn't contain this type.

Describe the solution you'd like
After adding 'NetCDF' to the allowed_types list, the create_coveragestore method works with NetCDF files. No other changes were necessary. However, I haven't tested all other functionalities/methods, so there might be more changes necessary for a full support.

Describe alternatives you've considered

Additional context
In order to use this the Geoserver NetCDF plugin(s) need to be installed.

[jougisljs]

GeoServer 2.20.3 for Windows , Python 3.10.2
Please help me , I try to use the code : BUT
#####################
cat.create_coveragestore('boa2021031', workspace='cite', type='NetCDF', contet_type='text/xml',
source_name='boa202103',
path=r'file:\test\BOA_Argo_2021_03.nc', layer_name='temp', create_layer=True)
#####################

Traceback (most recent call last):
File "D:\Python\geoapi\test3.py", line 8, in
reslut = cat.create_coveragestore('boa2021031', workspace='cite', type='NetCDF', contet_type='text/xml',
File "C:\Python310\lib\site-packages\geoserver\catalog.py", line 622, in create_coveragestore
raise FailedRequestError('Failed to create coverage/layer {} for : {}, {}'.format(layer_name, name,
geoserver.catalog.FailedRequestError: Failed to create coverage/layer temp for : boa2021031, 500