fix(entities.py): Use jinja instead of f-string

By the way, add the registration_callback function

owl2yams/generate_entities.py

 from yams.schema import Schema
 from typing import Dict
+import jinja2
+
+entities_template = jinja2.Template(
+    """
+from cubicweb.entities.adapters import EntityRDFAdapter
+from rdflib import URIRef, OWL
+
+{% for fragment, uri in entitytype_fragment_to_uri.items() %}
+class {{fragment}}RDFAdapter(EntityRDFAdapter):
+    def triples(self):
+        yield from super().triples()
+        yield(URIRef("{{uri}}"), OWL.sameAs, URIRef(self.uri))
+{% endfor %}
+
+
+def registration_callback(vreg):
+    vreg.register_all(
+        globals().values(),
+        __name__,
+        ({% for fragment in entitytype_fragment_to_uri %} {{fragment}}RDFAdapter, {% endfor %})
+    )
+
+"""
+)
 
 
 def generate_entities(
@@ -7,18 +31,6 @@
     entitytype_fragment_to_uri: Dict[str, str],
     relationtype_fragment_to_uri: Dict[str, str],
 ) -> str:
-    entities_py_content = """
-from cubicweb.entities.adapters import EntityRDFAdapter
-from rdflib import URIRef, OWL
-"""
-
-    for fragment, uri in entitytype_fragment_to_uri.items():
-        entities_py_content += f"""
-
-class {fragment}RDFAdapter(EntityRDFAdapter):
-    def triples(self):
-        yield from super().triples()
-        yield(URIRef("{uri}"), OWL.sameAs, URIRef(self.uri))
-"""
-
-    return entities_py_content
+    return entities_template.render(
+        entitytype_fragment_to_uri=entitytype_fragment_to_uri
+    )