Prepare 0.33.0 release

[veenstrajelmer]

Todo:

• speed up copernicusmarine_dataset_timerange #1058
• Discontinue copernicusmarine_reset() #1057
• copernicusmarine replace buffer with coordinates_selection_method #1050
• Fix preprocess_interpolate_nc_to_bc.py #780
• problem with slicing of time in open_dataset_extra #797
• Resolve deprecationwarning for pandas datetime parsing of nested columns #1063
• check warnings in testbank #803
• modelbuilder fix inexact latlon bbox #1066
• discontinue modelbuilder example python script #1068
• unique tide/cmems bc files with multiple polyfiles in modelbuilder #1070
• modelbuilder improve ERA5 experience #1072
• add function to overwrite several mdu keywords with coastal 2D/3D values #951
• Consider 12-hour offset for CMEMS data #878
• remove copernicusmarine temporary isoformat conversion #1047

Modelbuider notebook has features that are not supported by latest dfm_tools release yet:

• ext_new instead of ext_bnd in cmems_nc_to_bc() (add to whatsnew)
• usage of dfmt.meshkernel_get_bbox(mk_object)
• cmems bc files have changed names: unique tide/cmems bc files with multiple polyfiles in modelbuilder #1070

Optional:

• Avoid pytest warnings #1065
• fix hycom download #1048
• Extrapolation of CMEMS initial field #1021
• Non-orthogonal grid and illegal cells function #909
• add xugrid from_structured after From structured dataset xugrid#303?
• Run Python 3.13 testbank #559
• Consider h5netcdf dependency and default #484
• re-enable era5 tests on github #1005
• CDS beta raises unclear error about accepting licenses ecmwf/cdsapi#108 (also registered under CUS-25567)
• Clearer errors in case of incorrect authentication ecmwf/cdsapi#137
• CMEMS phyc not available in reanalysis #622
• snap observation points to nearest cell #898
• Flexible varkeys in dfmt.preprocess_merge_meteofiles_era5() #887
• Check support for numpy 2.0.0 #877
• set local source for tidal forcing #872
• DAP failure with GTSMv4.1_opendap tide source #613
• prevent calls to uds.grid in dfmt #363
• create issue template
• check warnings in testbank
• document all required repository secrets and what for