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* remove outdated docs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/prom/middleware.go

@@ -25,7 +25,7 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/cerc-io/ipld-eth-server/v4/pkg/log"
+	"github.com/cerc-io/ipld-eth-server/v5/pkg/log"
 	"github.com/google/uuid"
 
 	"github.com/ethereum/go-ethereum/rpc"

pkg/prom/serve.go

@@ -20,7 +20,7 @@ import (
 	"errors"
 	"net/http"
 
-	"github.com/cerc-io/ipld-eth-server/v4/pkg/log"
+	"github.com/cerc-io/ipld-eth-server/v5/pkg/log"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )