fix(openapi): Update google.rpc.Status schema name

[amckinney]

This updates the name of the schema generated for google.rpc.Status so that it's far less likely to collide with other names in the same package (e.g. a Status enum). This preserves the same wire format as the original Status type.

In the future, we can add google.rpc.Status as one of the recognized well-known types so that users can more easily integrate the type into other gRPC libraries.