feat: add customizable listen and connect addresses

[PovilasV1]

This PR enhances the Redpanda configuration template to provide more flexibility for network configuration:

• Adds redpanda_listen_address variable to control which interfaces Redpanda services bind to
• Adds redpanda_connection_address variable to specify how nodes advertise themselves to other nodes
• Adds remote_src_certs option to control whether certificates are sourced locally or from remote hosts

[CLAassistant]

All committers have signed the CLA.

[PovilasV1]

cc @gene-redpanda @r-vasquez

[gene-redpanda]

Checking it out

[PovilasV1]

@gene-redpanda any updates? 🙏

[gene-redpanda]

The private IP values have to be set private or the cluster can't talk to itself

[PovilasV1]

In our use case, we're actually using hostnames rather than public IPs, and we don't have a private network setup. Could you clarify if there are specific scenarios where hostname-based configuration would cause issues?