Upgrade to v5 schema

Now uses:
* ipld direct_by_leaf StateDB for basic queries
* trie_by_cid StateDB for trie slice and proof queries

Also:
* vulcanize => cerc refactor
* Backend method to close dbs
* state tests are in multiple packages, to allow separate ginkgo suites
* removes gap-filler module
* integration tests and github workflows
* run stack-orchestrator for testnet
* fix various issues with tests, hardhat server, dockerfile
* fix cmd flags / env vars
* fix flaky tests and clean up code
* remove unused code, scripts
* remove outdated docs
* update version

pkg/debug/backend.go

@@ -25,9 +25,8 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/eth/tracers"
-	"github.com/ethereum/go-ethereum/rpc"
 
-	"github.com/cerc-io/ipld-eth-server/v4/pkg/eth"
+	"github.com/cerc-io/ipld-eth-server/v5/pkg/eth"
 )
 
 var _ tracers.Backend = &Backend{}
@@ -43,9 +42,7 @@ type Backend struct {
 
 // StateAtBlock retrieves the state database associated with a certain block
 func (b *Backend) StateAtBlock(ctx context.Context, block *types.Block, reexec uint64, base *state.StateDB, checkLive, preferDisk bool) (*state.StateDB, tracers.StateReleaseFunc, error) {
-	rpcBlockNumber := rpc.BlockNumber(block.NumberU64())
-	statedb, _, err := b.StateAndHeaderByNumberOrHash(ctx, rpc.BlockNumberOrHashWithNumber(rpcBlockNumber))
-	return statedb, func() {}, err
+	return nil, func() {}, errMethodNotSupported
 }
 
 // StateAtTransaction returns the execution environment of a certain transaction