Lima should get proxy and dns settings from SystemConfiguration instead of from System_Profiler

### Description

This is a request to change the default behavior requested by @jandubois in #563 and resolved in #570.

The current method parses SystemProfiler output which only shows "Network Services" not all network interfaces. (e.g. most enterprise VPN interfaces are not included)

Apple provides a framework called SystemConfiguration that can provide more information about the network configuration of a Mac, AND give you the actual primary proxy and dns settings. The documentation for the Swift framework is here:
https://developer.apple.com/documentation/systemconfiguration

To take a look at what SystemConfiguration can provide, you can use the Mac built-in binary `scutil`:
`scutil --dns` will give you the list of DNS servers you should attempt in order of default routes/dns.
`scutil --proxy` will give you the proxy settings.
`scutil --nwi` will give you a true output of interfaces that the client has.

For instance right now, in System Preferences and System_Profiler I have 2 active services:

- Wi-Fi
- Thunderbolt Bridge

However, neither of those have proxy settings, and if you tried to send traffic out either, or use the DNS for either it would fail because I also have Cisco AnyConnect running configured with full tunnel.

If I run `scutil --nwi`, it outputs this instead:
```
Network information

IPv4 network interface information
utun3 : flags : 0x5 (IPv4,DNS)
address : 10.209.164.105
reach : 0x00000002 (Reachable)
en0 : flags : 0x5 (IPv4,DNS)
address : 172.16.32.47
reach : 0x00000002 (Reachable)

REACH : flags 0x00000002 (Reachable)

IPv6 network interface information
No IPv6 states found

REACH : flags 0x00000000 (Not Reachable)

Network interfaces: utun3 en0
```

And `scutil --proxy` outputs:
```
{
ProxyAutoConfigEnable : 1
ProxyAutoConfigURLString : http://host.domain.com/file.dat
}
```

DNS is super verbose too, but I'd have to redact half of it...