error: allow user and external group ids

The V2 Error group field only accepted header.GroupId, which would lead to validation errors when smpclient received v2 error responses from SMP groups beyond the standard set. This change allows creating ErrorV2 instances for both User Groups defined in the tree (i.e. Intercreate) as well as for User Groups defined outside of the tree.

smp/error.py

@@ -3,12 +3,12 @@
 from __future__ import annotations
 
 from enum import IntEnum, unique
-from typing import Generic, TypeVar
+from typing import Generic, TypeVar, Union
 
 from pydantic import BaseModel, ConfigDict
 
 from smp import message
-from smp.header import GroupId
+from smp.header import AnyGroupId, GroupId, UserGroupId
 
 T = TypeVar("T", bound=IntEnum)
 
@@ -80,7 +80,7 @@ class Err(BaseModel, Generic[T]):
 
     model_config = ConfigDict(extra="forbid", frozen=True, arbitrary_types_allowed=True)
 
-    group: GroupId
+    group: Union[GroupId | UserGroupId | AnyGroupId]
     rc: T