Adds the core V2 shim implementation for LCOW

[rawahars]

Summary

The V2 architecture represents a fundamental shift from a monolithic design to a decoupled, state-driven model. It fully embraces the containerd ecosystem and lays the structural groundwork required for Save/Restore (Live Migration) capabilities.

This issue tracks the PRs for adding the core implementation.

• Vendor containerd sandbox/v1 API #2599

• Adds VM Manager interfaces + implementation for UVM #2597

• adds guest manager interfaces + implementation for guest operations #2598

• add and patch containerd/pkg/shim to be used with new Windows shims #2601

• refactor common uvm code into vmutils package #2607

• add vmmem process lookup functionality + windows API abstraction #2613

• added the VM sandbox spec used by shim to generate the HCS document for sandbox #2609

• Refactor GCS logging and guest management for reusability #2612

• added LCOW Builder to generate final HCS document from annotations and options #2616

• [LCOW Builder] fix CPUGroup, VPMEM controller and StorageQoS parsing #2630

• [shimV2] Introduce locking at guestmanager layer #2638

• adds containerd-shim-lcow-v2 shim #2627

Core controllers

• [shimV2] added network controller implementation #2633

• [shimV2] adds vpci device controller #2643

• [shimV2] refactor scsi device controller to V2 template #2660

• [shimV2] Implements the VM SCSI Controller #2651

• [shimV2] Implements the VM VPMem Controller #2652

• [shimV2] refactor SCSI package to unify the interfaces with build tagged files #2666

• [shimV2] add plan9 device controller #2641

• [shimV2] [VM controller] refactor + adds Update + Device controllers #2663

• [shimV2] adds core pod, container and process controllers #2674

• [shimV2] implements task, shimdiag service and wires up pod/container controllers #2685

Discarded PRs

• [shimV2] add SCSI disk controller #2640
• refactor drivers util methods #2645
• [shimV2] adds the mount controller #2646
• [shimV2] adds SCSI disk manager #2648
• [shimV2] adds the container spec builder #2661