Describe your problem or use case

As part of migration (https://github.com/realm/realm-core/blob/master/src/realm.h#L72) we need to know the schema version to perform the appropriate migration steps from the old version to the new one. It is currently not possible to retrieve this through the C-API.

Describe the solution you'd like

Maybe just expose a realm_get_schema_version(realm_t)