Add `expand` to request

The API should be able to do something like:

`https://apis.accela.com/v4/records/E99-9999?expand=customTables`

response: Response = api_client.v4_get_records.sync_detailed(expand='customTables', client=api_client.authentication_client, custom_id='E99-9999')

Start at the Python entry point named v4_get_records.sync_detailed and inspect how its request parameters are defined and passed. Add support for expand so the customTables example can be requested for record E99-9999, then verify the generated request includes that query parameter.

Written by the indexing model from the issue text.