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* remove outdated docs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

version/version.go

@@ -19,9 +19,9 @@ package version
 import "fmt"
 
 const (
-	Major = 4       // Major version component of the current release
-	Minor = 2       // Minor version component of the current release
-	Patch = 0       // Patch version component of the current release
+	Major = 5       // Major version component of the current release
+	Minor = 0       // Minor version component of the current release
+	Patch = 1       // Patch version component of the current release
 	Meta  = "alpha" // Version metadata to append to the version string
 )