feat: add support for new DNS config settings (#82)

Add support for new DNS config settings:

- fallback DNS
- protection enabled switch
- rate limits per subnet
- rate limit whitelist
- blocked response TTL
- EDNS client subnet custom IP address
- blocked services schedule

.vscode/settings.json

@@ -1,13 +1,18 @@
 {
-  "go.testFlags": ["-v", "-tags=all", "-args", "-test.v"],
+  "go.testFlags": [
+    "-v",
+    "-tags=all",
+    "-args",
+    "-test.v"
+  ],
   "go.testEnvVars": {
     "TF_ACC": "1"
   },
   "go.testEnvFile": "${workspaceFolder}/.env",
   "[go]": {
     "editor.formatOnSave": true,
     "editor.codeActionsOnSave": {
-      "source.organizeImports": true
+      "source.organizeImports": "explicit"
     }
   },
   "gopls": {
@@ -19,4 +24,4 @@
     "completeUnimported": true, // autocomplete unimported packages
     "deepCompletion": true // enable deep completion
   },
-}
+}