activator: support for dzd metadata

[elitegreg]

Summary of Changes

• Adds support for allocating IPs/segment IDs to interfaces.
• Does not support reclaiming resources, this will be added in a later PR.

Testing Verification

• Unit tests
• E2E
• Manual testing

[Copilot]

Pull Request Overview

This PR adds support for allocating IPs and segment IDs to device interfaces in the activator component. The changes enable automatic assignment of segment routing IDs and IP addresses to device loopback interfaces, along with IP assignment to tunnel link interfaces during activation and deactivation processes.

• Adds segment routing ID allocation for device loopback interfaces
• Implements IP address assignment to tunnel interfaces during link activation/deactivation
• Updates device processing to handle interface metadata allocation

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
smartcontract/sdk/rs/src/lib.rs	Adds interface-related type imports to support device interface handling
smartcontract/programs/doublezero-record/src/instruction.rs	Updates size_of usage to use std::mem::size_of for consistency
activator/src/process/link.rs	Implements IP assignment to device interfaces during link activation/deactivation
activator/src/process/device.rs	Adds segment routing ID and loopback IP allocation for device interfaces
activator/src/activator.rs	Integrates segment routing ID allocator and updates device processing