show peer stats after sync

[ricomateo]

Motivation
Currently, the peer stats are only logged during the sync phase.
However we also want to see the peer stats after the node has finished syncing.

Description
This PR updates the periodically_show_peer_stats function to improve peer stats logs:

• During sync: peer stats are logged together with the sync progress.
• After sync: peer stats continue to be logged independently.

[github-actions]

Lines of code report

Total lines added: 45
Total lines removed: 0
Total lines changed: 45

Detailed view

+-----------------------------------------+-------+------+
| File                                    | Lines | Diff |
+-----------------------------------------+-------+------+
| ethrex/cmd/ethrex/initializers.rs       | 376   | +3   |
+-----------------------------------------+-------+------+
| ethrex/crates/networking/p2p/network.rs | 417   | +42  |
+-----------------------------------------+-------+------+