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* remove outdated docs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/net/api_test.go

@@ -17,10 +17,10 @@
 package net_test
 
 import (
-	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 
-	"github.com/cerc-io/ipld-eth-server/v4/pkg/net"
+	"github.com/cerc-io/ipld-eth-server/v5/pkg/net"
 )
 
 var _ = Describe("API", func() {

pkg/net/net_suite_test.go

@@ -20,8 +20,8 @@ import (
 	"io/ioutil"
 	"testing"
 
-	"github.com/cerc-io/ipld-eth-server/v4/pkg/log"
-	. "github.com/onsi/ginkgo"
+	"github.com/cerc-io/ipld-eth-server/v5/pkg/log"
+	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )