Use external main module

* renames main package so it's importable
* adds wrapmain sub-module as main module

go.mod

@@ -126,7 +126,6 @@ require (
 	github.com/mitchellh/pointerstructure v1.2.0 // indirect
 	github.com/mmcloughlin/addchain v0.4.0 // indirect
 	github.com/naoina/go-stringutil v0.1.0 // indirect
-	github.com/openrelayxyz/cardinal-types v1.1.1 // indirect
 	github.com/opentracing/opentracing-go v1.1.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
@@ -146,3 +145,5 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	rsc.io/tmplfunc v0.0.3 // indirect
 )
+
+replace github.com/openrelayxyz/plugeth-utils => git.vdb.to/cerc-io/plugeth-utils v0.0.0-20230614134222-d8d1347863d8