Cardano Updates

  Remove the CardanoNodeT/EraT monad transformer stack from CardanoClient
  in favour of plain functions that take LocalNodeConnectInfo as an explicit
  argument. All query and submission functions now have the form
  `LocalNodeConnectInfo -> ... -> IO a`, eliminating the need for
  runCardanoNode at call sites. Update all callers across hydra-node,
  hydra-cluster, hydra-tui, and hydra-chain-observer accordingly.

Signed-off-by: Sasha Bogicevic <[email protected]>

  Replace the data-passing ChainBackend class (where each method received
  an explicit backend value) with a monad-style class `ChainBackend m`
  where `m` is the computation monad. Each backend is now a newtype over
  ReaderT: DirectBackend wraps ReaderT DirectOptions IO and BlockfrostBackend
  wraps ReaderT BlockfrostOptions IO. Callers use runDirectBackend /
  runBlockfrostBackend runners to execute backend actions in IO.

Signed-off-by: Sasha Bogicevic <[email protected]>

Co-authored-by: Alexey Kuleshevich <[email protected]>