refactor(netx): extract tlsdialer from dialer

internal/engine/netx/dialer/eof_test.go

@@ -2,7 +2,6 @@ package dialer
 
 import (
 	"context"
-	"crypto/tls"
 	"io"
 	"net"
 	"time"
@@ -69,12 +68,3 @@ func (EOFAddr) Network() string {
 func (EOFAddr) String() string {
 	return "127.0.0.1:1234"
 }
-
-type EOFTLSHandshaker struct{}
-
-func (EOFTLSHandshaker) Handshake(
-	ctx context.Context, conn net.Conn, config *tls.Config,
-) (net.Conn, tls.ConnectionState, error) {
-	time.Sleep(10 * time.Microsecond)
-	return nil, tls.ConnectionState{}, io.EOF
-}