Add network feature to eth2

[macladson]

Proposed Changes

This reverts some of the changes from #8524 by adding back the typed network endpoints with an optional network feature. Without the network feature, these endpoints (and associated dependencies) will not be built.

This means the enr, multiaddr and libp2p-identity dependencies have returned but are now optional

[pawanjay176]

I'm not sure about this one.

Do we have any downstream users of this crate that would need the networking types to be the right ones and not strings?

[jxs]

I'm not sure about this one.

Do we have any downstream users of this crate that would need the networking types to be the right ones and not strings?

I was the one bringing this up in the previous PR to Mac. Since we’re using a typed language, it would be better to rely on the available types instead of Strings where possible right? 😅

[pawanjay176]

Sorry, just realised that this would not matter for beacon_node build because we already compile the networking crates for it.

We need to gate the get_node_identity function too though, otherwise no feature compilation would fail with

error[E0412]: cannot find type `IdentityData` in this scope
    --> common/eth2/src/lib.rs:1939:69
     |
1939 |     pub async fn get_node_identity(&self) -> Result<GenericResponse<IdentityData>, Error> {
     |                                                                     ^^^^^^^^^^^^ not found in this scope
     |
note: found an item that was configured out
    --> common/eth2/src/types.rs:568:12
     |
 566 | #[cfg(feature = "network")]
     |       ------------------- the item is gated behind the `network` feature

[macladson]

Ah nice catch, fixed here

[mergify]

Merge Queue Status

Rule: default

---

• ✅ Entered queue — 2026-02-12 20:21 UTC
• ✅ Checks passed · on draft merge queue: embarking unstable (96bc561) and [#8558 + #8695] together #8811
• ✅ Merged — 2026-02-12 20:51 UTC · at 88ddc227d7dab518f87e69fd70542e8ffc9d3b9e

This pull request spent 30 minutes 20 seconds in the queue, including 29 minutes 10 seconds running CI.

Required conditions to merge

• check-success=local-testnet-success
• check-success=test-suite-success