add mdb_options to initialize_mdbnomics, rename fetch_series

README.md

src/initialize_mdbnomics.m

src/mdbnomics.m

src/mdbnomics_datasets.m

src/mdbnomics_dimensions.m

src/mdbnomics_series.m

src/utils/fetch_series_by_api_link.m

src/utils/mdbnomics_providers.m