Set DNS resolver options in autogenerated resolver configuration

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**Is your feature request related to a problem? Please describe.**
I would like to configure the `timeout` and the retry `attempts` for a DNS resolver which is using autogenerated `/etc/resolver.conf`.

**Describe the solution you'd like**
I suppose that an extra parameter for `wsl.conf` section `network` would solve this.

It could be named `resolvConfOptions` and its type would be `string`.

The value would be added to the autogenerated `/etc/resolv.conf` as `options ...`

Example `wsl.conf`:

```ini
[network]
generateResolvConf = true
resolvConfOptions = "timeout:1 attempts:3"
```

This would produce the following example `/etc/resolv.conf`:

```
# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateResolvConf = false

# ... nameserver, search, etc here

options timeout:1 attempts:3
```

**Describe alternatives you've considered**
To the best of my knowledge, the only alternative at the moment is to turn off auto-generation and manage `/etc/resolv.conf` manually. This does not sound appealing as network settings and DNS server addresses do change.

Start by locating how the [network] section of wsl.conf is parsed and how autogenerated /etc/resolv.conf content is produced. Check any existing configuration or resolver-generation tests; done means the new option is accepted and its value appears as an options line in the generated file.

Written by the indexing model from the issue text.