Merge branch 'release-0.9.0' into 'main'

CHANGELOG.md

CITATION.cff

README_SETUP.md

README_SETUP.md

setup.cfg

src/caoscrawler/__init__.py

src/caoscrawler/cfood-schema.yml

src/caoscrawler/conv_impl/__init__.py

src/caoscrawler/converters/__init__.py

src/caoscrawler/converters/converters.py

src/caoscrawler/converters/hdf5_converter.py

src/caoscrawler/converters/spss.py

src/caoscrawler/converters/xml_converter.py

src/caoscrawler/crawl.py

src/caoscrawler/default_converters.yml

src/caoscrawler/structure_elements.py

src/caoscrawler/utils.py

src/doc/README_SETUP.md

src/doc/cfood.rst

src/doc/concepts.rst