Add OS version to messages metadata

[TomasTurina]

Related issue
#316

Description

This PR includes the OS version in the agent metadata. This includes:

• Registration requests.
• Stateless requests.
• Stateful requests.

Logs/Alerts example

Register:

{
    "groups": [],
    "host": {
        "architecture": "aarch64",
        "hostname": "tomas",
        "ip": [
            "192.168.64.16",
            "fde7:1d32:1c4f:33cc:70ef:32ff:fecc:228b"
        ],
        "os": {
            "name": "Ubuntu",
            "platform": "Linux",
            "version": "22.04.5 LTS (Jammy Jellyfish)"
        }
    },
    "id": "784832cf-f189-4da8-8abd-b5b99a23e9a2",
    "key": "KPhX7AZXe3FK32wj1hKFaZG8RnfdDRnE",
    "name": "tomas",
    "type": "Endpoint",
    "version": "5.0.0"
}

Stateful/stateless:

{
    "agent": {
        "groups": [],
        "host": {
            "architecture": "aarch64",
            "hostname": "tomas",
            "ip": [
                "192.168.64.16",
                "fde7:1d32:1c4f:33cc:70ef:32ff:fecc:228b"
            ],
            "os": {
                "name": "Ubuntu",
                "platform": "Linux",
                "version": "22.04.5 LTS (Jammy Jellyfish)"
            }
        },
        "id": "784832cf-f189-4da8-8abd-b5b99a23e9a2",
        "name": "tomas",
        "type": "Endpoint",
        "version": "5.0.0"
    }
}

Tests

• Compilation without warnings in every supported platform
  • Linux
  • Windows
  • MAC OS X

[cborla]

LGTM