core/vm: move Log to core/types

This significantly reduces the dependency closure of ethclient, which no
longer depends on core/vm as of this change.

All uses of vm.Logs are replaced by []*types.Log. NewLog is gone too,
the constructor simply returned a literal.

core/vm/interface.go

@@ -20,6 +20,7 @@ import (
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
 )
 
 // StateDB is an EVM database for full state querying.
@@ -58,7 +59,7 @@ type StateDB interface {
 	RevertToSnapshot(int)
 	Snapshot() int
 
-	AddLog(*Log)
+	AddLog(*types.Log)
 }
 
 // Account represents a contract or basic ethereum account.