feat(core/types): export rlpHash() (#163)

## Why this should be merged

Allows `core/types/hashing.go` to be deleted from `coreth`.

## How this works

Exported function acts as a proxy for unexported upstream function.

## How this was tested

NA

Author: ARR4N

core/types/rlp_payload.libevm.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"io"
 
+	"github.com/ava-labs/libevm/common"
 	"github.com/ava-labs/libevm/libevm/pseudo"
 	"github.com/ava-labs/libevm/libevm/register"
 	"github.com/ava-labs/libevm/libevm/testonly"
@@ -365,3 +366,8 @@ func (e *StateAccountExtra) Format(s fmt.State, verb rune) {
 	}
 	_, _ = s.Write([]byte(out))
 }
+
+// RLPHash returns the hash of the RLP encoding of `x`.
+func RLPHash(x any) common.Hash {
+	return rlpHash(x)
+}