v0.2.0

What's Changed

• Split haskell library into two parts: hydra-pay-core and hydra-pay. hydra-pay includes database components that cannot be included in frontend clients, while hydra-pay-core includes common components that are compatible with both frontend and backend clients.
• Add fanout to L1 workflow
• Add hydra balance retrieval
• Various stability improvements

Full Changelog: v0.1.1...v0.2.0