Add iroh doctor utility

[rklaehn]

Closes #979

The intent of the utility is to be able to do two things

• find out global network status, public ip and properties of local LAN/WLAN
• connect to one particular other peer

Example usage:

Report

> drderp report
getting report using derp map DerpMap {
    regions: {
        1: DerpRegion {
            region_id: 1,
            nodes: [
                DerpNode {
                    name: "default-1",
                    region_id: 1,
                    host_name: "derp.iroh.computer",
                    stun_only: false,
                    stun_port: 3478,
                    stun_test_ip: None,
                    ipv4: None,
                    ipv6: None,
                    derp_port: 0,
                },
            ],
            avoid: false,
            region_code: "default",
        },
    },
}
Report {
    udp: true,
    ipv6: false,
    ipv4: true,
    ipv6_can_send: false,
    ipv4_can_send: false,
    os_has_ipv6: true,
    icmpv4: false,
    mapping_varies_by_dest_ip: None,
    hair_pinning: Some(
        false,
    ),
    upnp: None,
    pmp: None,
    pcp: None,
    preferred_derp: 1,
    region_latency: {
        1: 123.08325ms,
    },
    region_v4_latency: {
        1: 123.08325ms,
    },
    region_v6_latency: {},
    global_v4: Some(
        82.76.245.176:64363,
    ),
    global_v6: None,
    captive_portal: None,
}

Connect

> drderp connect
run 'drderp connect 537a4f6d07d4edec7fff226c1ac63a9f9655ed57a10e534dc633b9ad6b119a2d' in another terminal or on another machine
(do as you are told)
sending 1 bytes
done in 2.597788667 s
speed 0.3849427833384262 bytes/s
sending 16 bytes
done in 0.745654084 s
speed 21.457670980851223 bytes/s
sending 256 bytes
done in 0.7459795 s
speed 343.1729692303877 bytes/s
sending 4096 bytes
done in 0.623054958 s
speed 6574.058913114371 bytes/s
sending 65536 bytes
done in 2.202245291 s
speed 29758.719552189974 bytes/s
test done

[rklaehn]

I turned it into a subcommand, as @dignifiedquire suggested:

❯ iroh dr-derp accept                                                                               
Run

iroh dr-derp connect 5b33f30b2b53bce0cb1c8853539fe373b95028c5783cbb62e420310219f0155e --remote-endpoint 82.76.245.176:57541 --remote-endpoint 192.168.1.135:57541

in another terminal or on another machine to connect by key and addr.
Omit the --remote-endpoint args to connect just by key.

Accepted connection. Performing test.

send: 193.63 MiB/s
recv: 193.15 MiB/s
echo: 93.73 MiB/s

[rklaehn]

Renamed to doctor and added gui on the connect side, so the connect side also has something to look at.