Changes to Update per-field metadata

added the new optional request property context

added the optional property context to the response with the 200 status

added the optional property context to the response with the 400 status

added the optional property context to the response with the 401 status

added the optional property context to the response with the 403 status

added the optional property context to the response with the 404 status

added the optional property context to the response with the 503 status

added the optional property context to the response with the 5XX status

the updates/items/path request property's minLength was increased from 0 to 1

added the new optional request property branch

endpoint added