oxidize: Sync all tokens in one go

[udoprog]

Due to legacy reasons, we currently fetch each token one-at-a-time through the api/connections/<id>?format=meta endpoint.

This can be improved by fetching all tokens through api/connections?format=meta, but would require minor re-architecting in how tokens are distributed throughout the application. In particular, they should be distributed through the injector and handled appropriately rather than returned.