Feat: DNS hosts support multiple addresses

[Loyalsoldier]

Now you can set hosts in dns section like this:

{
  "dns": {
    "hosts": {
      "ad.example.com": "127.0.0.1",
      "ads.example.com": ["127.0.0.1", "::1"],
      "geosite:category-ads": "127.0.0.1",
      "geosite:category-ads-all": ["127.0.0.1", "::1"]
    }
  }
}

If set IPs together with domains, only the first proxied domain one.example.com will be returned and all IPs will be ignored:

{
  "dns": {
    "hosts": {
      "ads.example.com": ["127.0.0.1", "::1", "one.example.com", "two.example.com"]
    }
  }
}

[xiaokangwang]

No issue discovered, we can merge this after we have release a stable version of v4.37.