FQDN support for UDP addresses list

**Describe the problem you have/What new integration you would like**
Would like to be able to use FQDN names in the UDP address list in addition to IP addresses.
This would allow users to use devicename.local addresses leveraging the advantages of mDNS and DNS and eliminate the burden of tracking IP addresses manually.

Addition of an FQDN option in lieu of an IP address. For example:
```
- id: udp_external
update_interval: 60s
addresses:
- remotedevice.local #<----- FQDN instead of an IP address
```

**Please describe your use case for this integration and alternatives you've tried:**

Problem is the current limitation of IP addresses only requires manual tracking of IP address to device mappings and precludes the possibility of using mDNS or DNS for address resolution.

**Additional context**

If adding FQDN to the addresses configuration variables is not possible due to existing code issues, an alternative could the addition of an FQDNs: configuration variable.