Support metadata for network north interfaces

[Copilot]

This PR implements metadata support for network interfaces, similar to what was done for file systems in PR #76. This addresses the discussion point from PR #116 about adding metadata capabilities to network sockets.

This finishes part of the work towards #119.

[jaybosamiya-ms]

Some changes are needed. Comments inline.

Top level comments:

• Make sure to run cargo fmt.
• FD-specific metadata requires coordination with #120 and #31, so should not be done as part of this PR. This also means that this does not lead to #119 being closed as done, but instead only completes a part of it. This is fine, the rest of it should be done as a separate PR anyways.

[jaybosamiya-ms]

Thanks, mostly looks good, minor suggestions. Please also make sure to run cargo fmt on the workspace, thanks!

[jaybosamiya-ms]

This PR should have also been largely straightforward for Copilot to do, but seemed to require a little more hand-holding. Part of it is that I mildly sent it down a tiny tangent, which I asked it to then revert, but the revert did not work out as well as I'd have liked.

Anyways, I've now manually fixed up the code needed for it. I don't know if I can say that this one in particular saved me enough time, but at least I think I now understand the scale of things that I can/should send over to Copilot coding agent, and which ones I should not.

[jaybosamiya-ms]

NOTE: The breaking changes from this (i.e. Network no longer being Send/Sync/UnwindSafe) is an unfortunate consequence of us (currently) storing the handles in a Vec, and should be fixed up as part of #31 to bring back Send/Sync to Network, because otherwise, the places it can be used gets somewhat throttled.

[CvvT]

This one looks like taking more manual efforts to make it right. Thanks Jay!

[github-actions]

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

Click for details

--- failure auto_trait_impl_removed: auto trait no longer implemented ---

Description:
A public type has stopped implementing one or more auto traits. This can break downstream code that depends on the traits being implemented.
        ref: https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.41.0/src/lints/auto_trait_impl_removed.ron

Failed in:
  type Network is no longer Send, in /home/runner/work/litebox/litebox/litebox/src/net/mod.rs:57
  type Network is no longer Sync, in /home/runner/work/litebox/litebox/litebox/src/net/mod.rs:57
  type Network is no longer RefUnwindSafe, in /home/runner/work/litebox/litebox/litebox/src/net/mod.rs:57