feat: allow enums in header parameters

(the currently supported) enums are int and string only, there's no reason not to allow them in headers (which is actually used in the wild).

Author: supermihi

openapi_python_client/parser/properties/enum_property.py

@@ -4,6 +4,7 @@
 
 import attr
 
+from ... import schema as oai
 from ... import utils
 from .property import Property
 from .schemas import Class
@@ -22,6 +23,13 @@ class EnumProperty(Property):
 
     template: ClassVar[str] = "enum_property.py.jinja"
 
+    _allowed_locations: ClassVar[Set[oai.ParameterLocation]] = {
+        oai.ParameterLocation.QUERY,
+        oai.ParameterLocation.PATH,
+        oai.ParameterLocation.COOKIE,
+        oai.ParameterLocation.HEADER,
+    }
+
     def get_base_type_string(self) -> str:
         return self.class_info.name