♻️ Add constraints & simple schema fixes

[falexwolf]

• Add unique constraints for feature and value in FeatureValue and ParamValue
• Add unique constraint for hash on FeatureSet
• Add a unique constraint for name for Feature?
• Fix:

  lnschema-core/lnschema_core/models.py

  Line 1096 in 5f81e9f

  User, PROTECT, default=current_user_id, related_name="created_transforms"

---

% lamin migrate create
Migrations for 'lnschema_core':
  lnschema_core/migrations/0053_alter_featureset_hash_alter_paramvalue_created_by_and_more.py
    - Alter field hash on featureset
    - Alter field created_by on paramvalue
    - Alter field created_by on run
    - Alter field created_by on transform
    - Alter unique_together for featurevalue (1 constraint(s))
    - Alter unique_together for paramvalue (1 constraint(s))