add era5 and smap datasets from smart monitoring module to catalog

dataset signature in the backend module:

era_rain=d.era_products(variable='total_precipitation',time_res='daily',
                        login_credentials={'url':'********','key':'********'})

smap_moist=d.smapsoilmoist(satellite_product={'name':'SPL2SMAP_S.003',
                                              'parameter':'soil_moisture',
                                              'resolution_km':3},
                           login_credentials={'User':'********','Password':'*********'})

also see https://git.geomar.de/digital-earth/de-smart-monitoring-backend-module/-/blob/52-add-international-datasets-on-weather-and-soil-moisture-to-data-catalogue/module.py#L60

in case of the era5 product, we might have to replace url/key with user/password.