Using DNS for P2P's bootstraping seeds

### Is your feature request related to a problem?

Right now, to join the network, you need to have a specific list of peers to contact in order to join the network.
This requires a custom configuration, which should not be in order to open the network.

### Describe the solution you'd like

I propose to use a DNS lookup to fetch the bootstrapping seeds when a node joins the network. This way the network opened to everyone would be easier to extend as it will not require a custom / configuration based to fetch the initial nodes to connect at the first place.
We could still use some hardcoded endpoints for backup of the DNS provided seeds list.

### Additional context

_No response_

### Epic

_No response_

No files, tests, or entry points are named. Start by tracing how the node currently obtains its bootstrap peers and where hardcoded endpoints are configured, then investigate how DNS-provided seeds and fallback endpoints should be represented and validated. Done means a node can join using DNS seeds while retaining the proposed backup behavior.

Written by the indexing model from the issue text.