Rename a field in schema

Let's say that we had a "summary" field before but now we want to rename it to "bio".

1. Rename summary field to bio in users.BaseUser

2. Add the following migration to versions.v2001_01_01:

   from cadwyn import (
       VersionChange,
       schema,
       convert_response_to_previous_version_for,
       convert_request_to_next_version_for,
       ResponseInfo,
       RequestInfo,
   )
   from users import BaseUser, UserCreateRequest, UserResource
   
   
   class RenameSummaryIntoBioInUser(VersionChange):
       description = (
           "Rename 'summary' field into 'bio' to keep up with industry standards"
       )
       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")