feat: complete basic functions

Support http,dns and mysql connection. Support custom http, dns response. Support dns rebinding.
Support mysql load local files and jdbc deserialize exploit.

internal/database/db.go

@@ -0,0 +1,13 @@
+package database
+
+import "gorm.io/gorm"
+
+var DB *gorm.DB
+
+func InitDB(driver, dsn string) (err error) {
+	switch driver {
+	case "sqlite":
+		DB, err = NewSqlite3(dsn)
+	}
+	return
+}