is_ipv4_address fix to check string of comma separated IP addresses instead of just one address.

[veso-k]

Hello, all!
According tho the official documentation here:
https://galaxy.ansible.com/ui/repo/published/pfsensible/core/content/module/pfsense_dns_resolver/?keywords=dns_
ip is required string and should contain IPv4 or IPv6 comma-separated addresses to be returned for the host.

So when I have this structure it fails:
item={'host': 'storage', 'domain': 'googleapis.com', 'ip': '192.168.0.1,192.168.0.2', 'descr': 'some description'}
and works with this:
item={'host': 'storage', 'domain': 'googleapis.com', 'ip': '192.168.0.1', 'descr': 'some description'}

I want to create PR to change is_ipv4_address function in core/plugins/module_utils/__impl/addresses.py like this:

def is_ipv4_address(address):
    try:
        return all(
            isinstance(ip_address(addr.strip()), IPv4Address)
            for addr in address.split(",")
        )
    except ValueError:
        return False

Thank you!