FIX: Make `sc-network-sync` types Public (#3586)
This PR makes `sc-network-sync` types public following [this](https://github.com/paritytech/polkadot-sdk/issues/3556) issue. Fixes #3556
This PR makes `sc-network-sync` types public following [this](https://github.com/paritytech/polkadot-sdk/issues/3556) issue. Fixes #3556