Conway Consensus Examples

Consensus uses examples from the ledger for testing. In particular, the type `ShelleyLedgerExamples` captures all the examples that are needed for each era. We need Conway examples.

For example, the Alonzo examples are [here](https://github.com/input-output-hk/cardano-ledger/blob/73f9c089981e587a0b2698ef6ad65d75fb41a85f/eras/alonzo/test-suite/src/Test/Cardano/Ledger/Alonzo/Examples/Consensus.hs).