feat(l1): improved lookup interval

[ElFantasma]

Motivation

Node lookup interval is used to send FindNode and ENRRequest messages for discovery and to try initiate new RLPx connections and currently it uses only two values.

Description

• This PR changes it for a variable interval according to the peer target completion.
• Also it provides a CLI argument to set up the initial interval, to be able to set the node more or less eager on startup.

Closes #5149 (also addresses #5148, already closed)

[github-actions]

Lines of code report

Total lines added: 46
Total lines removed: 6
Total lines changed: 52

Detailed view

+---------------------------------------------------+-------+------+
| File                                              | Lines | Diff |
+---------------------------------------------------+-------+------+
| ethrex/cmd/ethrex/cli.rs                          | 779   | +11  |
+---------------------------------------------------+-------+------+
| ethrex/cmd/ethrex/initializers.rs                 | 454   | +1   |
+---------------------------------------------------+-------+------+
| ethrex/cmd/ethrex/l2/initializers.rs              | 334   | +1   |
+---------------------------------------------------+-------+------+
| ethrex/crates/networking/p2p/discv4/peer_table.rs | 1049  | +11  |
+---------------------------------------------------+-------+------+
| ethrex/crates/networking/p2p/discv4/server.rs     | 652   | +17  |
+---------------------------------------------------+-------+------+
| ethrex/crates/networking/p2p/network.rs           | 367   | +4   |
+---------------------------------------------------+-------+------+
| ethrex/crates/networking/p2p/rlpx/initiator.rs    | 105   | -6   |
+---------------------------------------------------+-------+------+
| ethrex/crates/networking/rpc/test_utils.rs        | 298   | +1   |
+---------------------------------------------------+-------+------+

[Oppen]

LGTM, I'll test it at home and approve if able to sync.