restore custom formatter errors

`InvalidCustomFormatterValue` grows in scope of responsibility, as
`FormatUnmarshalError` is no longer available.

Refs: python-openapi/openapi-core#562

Signed-off-by: Mike Fiedler <[email protected]>

Author: miketheman

Diff for: pyramid_openapi3/exceptions.py

@@ -2,7 +2,7 @@
 
 from dataclasses import dataclass
 from openapi_core.exceptions import OpenAPIError
-from openapi_core.unmarshalling.schemas.exceptions import FormatUnmarshalError
+from openapi_core.unmarshalling.schemas.exceptions import UnmarshallerError
 from pyramid.httpexceptions import HTTPBadRequest
 from pyramid.httpexceptions import HTTPInternalServerError
 from pyramid.request import Request
@@ -49,10 +49,13 @@ def __str__(self) -> str:
 
 
 @dataclass
-class InvalidCustomFormatterValue(FormatUnmarshalError):
+class InvalidCustomFormatterValue(UnmarshallerError):
     """Value failed to format with a custom formatter."""
 
     field: str
+    value: str
+    type: str  # noqa: A003 # we use `type` as a dataclass field name
+    original_exception: Exception
 
     def __str__(self) -> str:
         """Provide more control over error message."""

Diff for: pyramid_openapi3/tests/test_extract_errors.py

@@ -572,7 +572,7 @@ def unique_name(self, name: str) -> bool:
         if name in ["alice", "bob"]:
             raise RequestValidationError(
                 errors=[
-                    InvalidCustomFormatterValue(  # type: ignore
+                    InvalidCustomFormatterValue(
                         value=name,
                         type="unique-name",
                         original_exception=Exception(