refactor: enable -netinfo to add future networks (i2p, cjdns)
refactor: enable -netinfo to add future networks (i2p, cjdns)

Summary:
After this commit, a new network may be added by changing 4 lines:
- increment the value of `m_networks_size`
- add the network name to `m_networks`
- add the network name to this line: `result += "        ipv4    ipv6   onion   total  block-relay\n";`
- add "counts.at(i).at(<m_networks pos>)" to this line: `result += strprintf("%-5s  %5i   %5i   %5i   %5i   %5i\n...`

This is a backport of [[https://github.com/bitcoin/bitcoin/pull/20002 | core#20002]] [5/5]
https://github.com/bitcoin/bitcoin/pull/20002/commits/6272604bef3b409455b010d134b4b62c8f6ff49f

Depends on D10505

Test Plan: `ninja all check-all`

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10506

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