Refactor bundle functionality

.gitignore

.vscode/settings.json

gui/src/components/DataStore.js

nomad/app/v1/routers/uploads.py

nomad/bundles.py

nomad/cli/admin/uploads.py

nomad/config.py

nomad/files.py

nomad/processing/base.py

nomad/processing/data.py

nomad/utils/exampledata.py

tests/app/v1/routers/test_uploads.py

tests/conftest.py

tests/processing/test_base.py

tests/processing/test_data.py

tests/processing/test_edit_metadata.py