[3.2] Add missing exceptions (#588)

django-stubs/core/exceptions.pyi

@@ -16,6 +16,8 @@ class DisallowedHost(SuspiciousOperation): ...
 class DisallowedRedirect(SuspiciousOperation): ...
 class TooManyFieldsSent(SuspiciousOperation): ...
 class RequestDataTooBig(SuspiciousOperation): ...
+class RequestAborted(Exception): ...
+class BadRequest(Exception): ...
 class PermissionDenied(Exception): ...
 class ViewDoesNotExist(Exception): ...
 class MiddlewareNotUsed(Exception): ...
@@ -41,3 +43,4 @@ class ValidationError(Exception):
     def __iter__(self) -> Iterator[Union[Tuple[str, List[str]], str]]: ...
 
 class EmptyResultSet(Exception): ...
+class SynchronousOnlyOperation(Exception): ...