VTex Get Seller data by ID

Marketplace operator may call this endpoint to retrieve information about a specific seller by filtering by ID. It is also possible to filter results by sales channel (or [trade policy](https://help.vtex.com/en/tutorial/como-funciona-uma-politica-comercial--6Xef8PZiFm40kg2STrMkMV#master-data)) through the `sc` query param.