Activate babbage/conway eras on devnet

[jpraynaud]

Why

We want to upgrade our Cardano devnet so that it is able to activate babbage and/or conway eras. The babbage era is mandatory in order to test the PallasChainObserver UTxO related functions. Also the code of the devnet is very monolithic and is hard to understand.

What

Refactor the devnet in order to implement the activation of the latest Cardano eras. Also add the capability for the end to end test to use the CardanoChain era reader adapter instead of the Dummy era reader adapter.

How

• Refactor the devnet file generation mechanism
• Implement the babbage and conway eras hard forks (with possibility to hard fork at given epoch)
• Adapt the end to end test accordingly
• Adapt the CI accordingly
• Optimize execution time for the end to end test

Later

• Transition era reader adapter to CardanoChain
• Rename all BFT nodes mentions to Full nodes (as there is not anymore BFT nodes in the devnet)
• Rotate KES keys script