[Feature] Legacy API (#224)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#224

epdb/logic.py

@@ -579,6 +579,14 @@ class PackageManager(object):
         else:
             _ = perm_cls.objects.update_or_create(defaults={"permission": new_perm}, **data)
 
+    @staticmethod
+    def grant_read(caller: User, package: Package, grantee: Union[User, Group]):
+        PackageManager.update_permissions(caller, package, grantee, Permission.READ[0])
+
+    @staticmethod
+    def grant_write(caller: User, package: Package, grantee: Union[User, Group]):
+        PackageManager.update_permissions(caller, package, grantee, Permission.WRITE[0])
+
     @staticmethod
     @transaction.atomic
     def import_legacy_package(
@@ -595,7 +603,6 @@ class PackageManager(object):
             CompoundStructure,
             Edge,
             Node,
-            Package,
             ParallelRule,
             Pathway,
             Reaction,