Multiple addresses support

With the current implementation of address function, there is no possibility to retrieve multiple addresses assign to the interface. For configuration like this:
```
eth0:
[ { address: '10.0.2.15',
netmask: '255.255.255.0',
family: 'IPv4',
mac: '08:00:27:88:0c:a6',
internal: false },
{ address: '10.0.2.16',
netmask: '255.255.255.0',
family: 'IPv4',
mac: '08:00:27:88:0c:a6',
internal: false },
{ address: 'fe80::a00:27ff:fe88:ca6',
netmask: 'ffff:ffff:ffff:ffff::',
family: 'IPv6',
mac: '08:00:27:88:0c:a6',
scopeid: 2,
internal: false } ] }
```
there is no possibility to gather both assign addresses (10.0.2.15 and 10.0.2.16).

Start by locating the current address function in the node-ip implementation and inspect how it selects an address from an interface's address list. Use the multi-address eth0 example in the issue as the reproduction case. Done means callers can retrieve both IPv4 addresses, while preserving the existing interface information and behavior for single-address configurations.

Written by the indexing model from the issue text.