Rename a field in schema

Assume you had a summary field before but now you want to rename it to bio.

1. Rename the summary field to bio in users.BaseUser

2. Add the following migration to versions.v2001_01_01:

   from cadwyn import (
       RequestInfo,
       ResponseInfo,
       VersionChange,
       convert_request_to_next_version_for,
       convert_response_to_previous_version_for,
       schema,
   )
   from users import BaseUser, UserCreateRequest, UserResource
   
   
   class RenameUserSummaryToBio(VersionChange):
       """The user profile field 'summary' is now named 'bio' to match familiar
       profile terminology.
       """
   
       instructions_to_migrate_to_previous_version = (
           schema(BaseUser).field("bio").had(name="summary"),
       )
   
       @convert_request_to_next_version_for(UserCreateRequest)
       def rename_bio_to_summary(request: RequestInfo):
           request.body["summary"] = request.body.pop("bio")
   
       @convert_response_to_previous_version_for(UserResource)
       def rename_bio_to_summary(response: ResponseInfo):
           response.body["bio"] = response.body.pop("summary")