Function places::api::places_api::places_api_new

pub fn places_api_new(db_name: impl AsRef<Path>) -> ApiResult<Arc<PlacesApi>>

For uniffi we need to expose our Arc returning constructor as a global function :( https://github.com/mozilla/uniffi-rs/pull/1063 would fix this, but got some pushback meaning we are forced into this unfortunate workaround.