feat: state the device's own address in origin.ip

[DavidCozens]

Add the ip PARAM to the origin element, sourced from the same interface address the HOSTNAME field
reports.

struct SolidSyslogOriginSdConfig originConfig = {
    /* ... as the previous stage ... */
    .GetIpCount = SyslogOriginIpCount,
    .GetIpAt    = SyslogOriginIpAt,
};

... [origin software="solid-syslog-example" swVersion="0.1.0" enterpriseId="32473" ip="10.0.2.15"] device started

A relay or NAT between the device and the collector rewrites the address the collector observes.
ip is what the device says about itself, and that survives the hop.

The PARAM is repeatable, so the library asks for a count and then one value per index rather than
taking a single string. This device has one address and returns one, and returns none before the
interface has an address — a count of zero omits the PARAM rather than emitting an empty one.

SyslogFields_IpAddress becomes the single place that reads the address, and HOSTNAME formats the
same string through it. Two fields that must agree now cannot disagree.

When you need it. If anything sits between the device and the collector — a relay, a gateway, or
NAT — and the source address the collector sees can no longer be trusted to identify the device.

[DavidCozens]

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