chore: support configuring DiscV5 and DNS-discovery

### Background

https://github.com/waku-org/nwaku/issues/2420

### Pre-requisite

https://github.com/waku-org/nwaku/issues/2455

### Details

It should be possible to set up a nodejs waku node that internally runs DiscV5 and or DNS-discovery. These settings might come from a JSON configuration object.