feature/finalize API

• Finalized Agreement (Signed by Data Provider, Data Consumer and GX-DCS)
  • • Finalization Provider authorization (GX partipipants)
  • • Finalize content validation
  • • Finalize signature validation: To finalize an Agreement, the GX-DCS MUST first validate, that the signatures of both the Data Provider and the Data Consumer are valid.
  • • Finalization approval: MUST sign the Agreement while including the signatures of Data Provider and Data Consumer in the hash
  • • Finalization distribution: return contract in response