refactor: consolidate celestia-prover

[rootulp]

Closes #109

Testing

$ cargo run -p celestia-prover

starts the server and I can query verifier keys:

$     grpcurl -plaintext localhost:50051 celestia.prover.v1.Prover/Info
{
  "stateTransitionVerifierKey": "0x007279d4076a55500ad2d12fbcb6e336958713327a6020417094a5210eb4d455",
  "stateMembershipVerifierKey": "0x003e36b7393697dd4a69cf0c660974825932095295a4fbbe0bab7982dfbffda7"
}