feat(ftp): support receive ftp connection (#6)

Co-authored-by: E99p1ant <[email protected]>

pkg/ftp/config.go

@@ -0,0 +1,8 @@
+package ftp
+
+type Config struct {
+	Enable   bool
+	Addr     string
+	PasvIP   string `yaml:"pasv_ip"`
+	PasvPort int    `yaml:"pasv_port"`
+}