refactor: move dialer's errorwrapper in i/errorsx (#417)

Part of https://github.com/ooni/probe/issues/1505

internal/engine/netx/dialer/errorwrapper.go

@@ -1,61 +0,0 @@
-package dialer
-
-import (
-	"context"
-	"net"
-
-	"github.com/ooni/probe-cli/v3/internal/errorsx"
-)
-
-// errorWrapperDialer is a dialer that performs err wrapping
-type errorWrapperDialer struct {
-	Dialer
-}
-
-// DialContext implements Dialer.DialContext
-func (d *errorWrapperDialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
-	conn, err := d.Dialer.DialContext(ctx, network, address)
-	err = errorsx.SafeErrWrapperBuilder{
-		Error:     err,
-		Operation: errorsx.ConnectOperation,
-	}.MaybeBuild()
-	if err != nil {
-		return nil, err
-	}
-	return &errorWrapperConn{Conn: conn}, nil
-}
-
-// errorWrapperConn is a net.Conn that performs error wrapping.
-type errorWrapperConn struct {
-	net.Conn
-}
-
-// Read implements net.Conn.Read
-func (c *errorWrapperConn) Read(b []byte) (n int, err error) {
-	n, err = c.Conn.Read(b)
-	err = errorsx.SafeErrWrapperBuilder{
-		Error:     err,
-		Operation: errorsx.ReadOperation,
-	}.MaybeBuild()
-	return
-}
-
-// Write implements net.Conn.Write
-func (c *errorWrapperConn) Write(b []byte) (n int, err error) {
-	n, err = c.Conn.Write(b)
-	err = errorsx.SafeErrWrapperBuilder{
-		Error:     err,
-		Operation: errorsx.WriteOperation,
-	}.MaybeBuild()
-	return
-}
-
-// Close implements net.Conn.Close
-func (c *errorWrapperConn) Close() (err error) {
-	err = c.Conn.Close()
-	err = errorsx.SafeErrWrapperBuilder{
-		Error:     err,
-		Operation: errorsx.CloseOperation,
-	}.MaybeBuild()
-	return
-}