Move bitswap and transactions protocol out of sc-network

[bkchr]

Alongside #8686 we should also move out transactions and bitswap protocol out of sc-network. These protocols should go on their own crates. While doing this we should also clear up Behaviour::new to take all ProtocolConfigs in the request_response_protocols vector. There should be no need that we list all the other protocols on individually.

• Move out transactions protocol: https://github.com/paritytech/substrate/tree/57e3486d9c7bb4deaef33cf9ba2da083b4e40314/client/network/src/transactions.rs
• Move out bitswap protocol: https://github.com/paritytech/substrate/tree/57e3486d9c7bb4deaef33cf9ba2da083b4e40314/client/network/src/bitswap.rs
• Refactor Behaviour::new.

[bkchr]

When moving out the bitswap protocol, we need to revert the changes done in this pr: #12082

[altonen]

The last bullet will be fixed as part of one of the upcoming pull requests that move syncing out of sc-network. Right now the protocols (even their names) are too deeply integrated into the code.