Implement Gaia-X compliance

[royscheeren]

Problem statement

The result of #449 need to be implemented
The client side asset validation must be extended for Gaia-x compliant metadata

We now expect 3 metadata files:

• Manifest.json
• domainMetadata.json
• gaiaxMetadata.json

Definition of Done

• We find gaiax metadata (json+LD + isMetadata) in hasArtifacts of hasExternalArtifacts
• We check it against the gaiax shacl for compliance
• Gaia-x compliance is optional, if not gaia-x compliant the UI shows warning
• Save gaiax metadata in DB
• If compliant, display gaia-x metadata in the asset with a stamp