Support dynamically specified networks

[SebastienGllmt]

Currently Carp only supports a fixed set of networks (preprod, preview, sanchonet, mainnet)

However, to be able to test easily on local networks, we need to support the ability to connect to a custom network whose genesis files and contents are provided after compile-time.

Missing features:

• [x] utility functions to parse required information from genesis & network configs for a network
• [ ] properly populate CardanoNet config