construct target metadata using pydantic model.

...ckend_regimo/components/oep_access/excel_sheet_adapter.py

services/backend_regimo/components/oep_access/oemeta.py

...s/oep_access/oemeta/latest/build_source/schemas/fields.py

...p_access/oemeta/latest/build_source/schemas/provenance.py

...d_regimo/components/oep_access/oemeta/latest/example.json

...ackend_regimo/components/oep_access/oemeta/target_meta.py

services/backend_regimo/components/oep_access/settings.py

...d_regimo/components/oep_access/table_as_current_meta.json

...o/components/oep_access/table_as_current_meta_wizard.json

...backend_regimo/components/oep_access/table_as_on_oep.json

services/backend_regimo/components/oep_access/upload_LLEC.py

services/backend_regimo/data/LLEC_Data