[6.15.z] host: added field reported_data

[Satellite-QE]

Cherrypick of PR: #1202

Description of changes

Added new field reported_data to the Host entity.
This field is optional and it is not present for all host instances,
only for those reporting real data, like bare metal hosts and so.

Functional demonstration

Example:

In [1]: from nailgun.entities import Host
In [2]: host = Host().search(query={'search': f'name=sat.instance.addr.com'})[0]
In [3]: host.reported_data
Out [3]:
{
    "boot_time": "2024-06-21 16:44:18 +0200",
    "cores": 6,
    "sockets": 6,
    "disks_total": 107374182400,
    "kernel_version": "5.14.0-427.20.1.el9_4.x86_64",
    "bios_vendor": "SeaBIOS",
    "bios_release_date": "04/01/2014",
    "bios_version": "1.16.1-1.el9"
}