developing steps

[budschi]

• @budschi makes schema working itself

• move functionalitlies from nomad_helpers.py into normalizer functions in schema_package

• add parsing functionality

• prepare for metadata extraction directly in NORTH on NOMAD Oasis

[budschi]

the schema itself seems to work as we have written it. There was an error in the path to the schema in the semtest.archive.yaml